In Control panel we have three buttons for a point partial selection:

1. Remove selected anchor points.
   Does the same as a menu command Object > Path > Remove Anchor Points, and this command can have a hotkey assigned to

2. Connect selected end points.
   Does the same as a menu command Object > Path > Join, and has a default hotkey. Why Ai uses both 'Join' and 'connect' for the same operation, and also has 'Join' tool, which does a pretty different thing — is an UX mystery.

3. Cut path at selected anchor points.
   There is NO a menu command for that, and this button can NOT have a hotkey or written into an action (which is a bad workaround anyway, because an action which has only one operation is an excuse for not having an ability to assign a hotkey to the command directly, like with scripts).

We need this hotkey.
We need all the hotkeys — https://illustrator.uservoice.com/forums/333657/suggestions/31609237

To fill in my drawing outlines or an object, I have to select the section of outlines or shapes first, which is dumb, because in selecting the outlines or shapes, the color fill automatically changes to the color whatever is selected (the color of the stroke or shape's outline, that I want to fill in with a different color. This is made even more frustrating when I have to use the eyedropper to select a fill color, only for my color section to immediately change, upon reselecting the shape outlines I intended to fill in.

It is also a pain that I seem unable to use the live paint within paint brush stroke outlines, unless the lines are switched to pencil lines or flattened.

Maybe I just don't know how to properly use the tool. Instead I have to always color in my pictures with filled shapes I make from brush strokes, rather than the live paint bucket tool. I feel like the tool needs a major fix to make it simpler to use.

Do a better implementation of Actions. More like Photoshop.

Some of the menu itens are not recorded in Actions, and others even with the Insert Menu item, still won't record the custom settings of it, and everytime you play that action, it will bring default values to it and open context menu to you to reenter parameters.
This must be implemented correctly, direclty with the record and not that patch "Insert Menu Item" option that exist today.
You should only hit record, do the menu options (even the Effects ones), and it must record it with all custom config you do, giving the option to edit the options on the action panel, but when you press play for that action, it should perform altomaticaly every step without interruptions (except when you choose it to).

Please, make a proper full Action implementation in Illustrator.

When using Select and Direct Selection Tools, you can duplicate elements by holding ALT-key down.

But if you release the ALT-key before you release the Mouse Button, the duplicating ceases . This differs from how most of the other applications behaves. For example in Photoshop, duplicating continues even if you release the ALT before you release mouse button.

How this works in Illustrator leads often to situations where you think you have duplicated something, but you actually just moved it. And often I edit the element I thought I duplicated, and loose lot of work as it wasn't actually duplicated and I edited the original.

Very Frustrating
I can't believe how many this kind of little annoying things Illustrator has. Every time I have to use it, my day is ruined. This is one of those days. I can't understand how a developer with size and budget like Adobe can't get these fixed.

The Eyedropper tool has several cursors (it’s almost impossible to find any explanations about at helpx.adobe.com), displaying different states:
- a filled pipette for when you click,
- a pipette with square below to indicate a screen sampling,
- an additional T to indicate a text below,
- a reverse filled pipette to indicate apply mode.
However, some modes are missing.

When you have smart guides disabled (for any reason), you can’t tell which object the tool will pick from, what attribute or will you miss completely by a pixel. The Shift mode is not covered too. So we need these:
- a cursor to indicate Shift is held ('direct translation mode')
- a way to indicate an art is under the cursor and not the blank canvas
- a preview of colors picked and/or a hint to indicate which attributes will get picked if you click (and an option to disable it)

Hi, I like Illustrator for many reasons, but I find one little thing is annoying. So often I need to prepare the design files for my printer. And because the color picker doesn't have the feature of auto rounding up the digits, the color I used always has decimals, instead of a rounded up number in CMYK mode. It is not easy for the printer to process these color data. I have to round up each color manually, which is time-consuming and I might miss some elements. So is it possible to have the color picker have an option of rounding up digital for the color it picked up? And in the Appearance panel, the color digits are always not the same as the color picker panels show, which has the decimal digits.