As comments for this thread are closet, I start a new one.
https://illustrator.uservoice.com/forums/333657-illustrator-desktop-feature-requests/suggestions/32015539-custom-presets-for-asset-export-export-for-scree

This Preset thing is a disaster. It doesn't fix any issues I have with Export For Screens.

It doesn't save the Folder for the export. So I have to set it every time I open my document, as Illustrator set it to the same folder as where my AI document is. This was, and now still is, my major problem with Export for Screens.

Also, I have to select the Preset every time I open my AI file. The least I was hoping was that the settings would be saved on document basis.

Management of presets is terrible, as you can't edit those. And it is getting quite messy when you need just a little bit more presets.

It is impossible to export PNGs with both white and transparent background at same time, as that option is in PNG options, that will affect all the exported files. How can you make such a stupid system?

I waited years for this updated and now I'm very disappointed. It baffles me how the developers managed to deliver such a terrible solution for simple problems.

It seems that Illustrator developers are just incapable of understanding what users require. Possible solutions for these issues have been given many times in several threads.

How a developer size of Adobe can fail so majestically when trying to implement some basic functionality. What The F they are doing there? Do you have the slightest idea how your apps should work?

I sincerely hate Adobe.