Panelize Blend Options, Offset Path, etc.
In pre-2020 Illustrator versions, the Path -> Simplify tool was a window. Post 2020, it got changed into a live panel which, when opened, doesn't halt the focus and lets you change settings while you move around the artboard with the Hand tool or Zoom in or such.
It is sadly the only "classic" Object tool that got this treatment. Other tools, especially Blend Options, Offset Path, Envelope Distort with Warp, etc. would benefit greatly from similar panelisation. It's not a great user experience that I can't zoom or pan while I'm trying to offset my path.
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I upvote this.
There is a separate request about Blend, Put all Blend options and commands into one dialog / panel — http://illustrator.uservoice.com/forums/333657/suggestions/31988758
But I agree many of the 'hard' dialogs would benefit from being a panel or an 'ephemeral' panel, similar to Smooth or Simplify (but not the compact Recolor, it sucks).
Funnily though, some dialogs don’t take away zooming and panning, when a mouse wheel is used, but I have no idea why...