This isnt a com_fields issue. This is a com_media manager as it is the same wherever the media manager is used

com_fields is being shouted about as the next major feature of Joomla.

The user experience of using com_fields media selector is pathetic

Therefore when Joomla starts shouting about its brand new com_fields media type feature - the user experience will be crap

Then com_fields will get a bad name

ergo, this is a com_fields issue...

I agree that the CODE that powers this feature is not in com_fields, but in com_media, however this IS used by the new (and some have said, exciting) new feature of Joomla - thus if you want to shout about great new features, at least make sure that all dependancies of those new features look and work well.

the user experience will be crap

As @brianteeman already said, this media manager view is loaded also when you edit an article and want to change the images of an article, so the user experience is crap there as well. But there is some hope. For Joomla 4 we are going to revamp the media manager and are working close with the UX team (by the way, UX is looking for some people, perhaps you might consider to join them), so hopefully we can then do better. I guess in the meantime we have to live with what we have right now, even tough you don't want to hear that.

For Joomla 4 we are going to revamp the media manager

Yeah, I heard the same story for Joomla 3, never happened...

working close with the UX team

The same UX team headed by @cpfeifer who told me I was "expecting too much of him" to make simply timely decisions about "basic" UX issues months ago... yeah, I've lost all hope in that team - the real people that know about UX have already abandoned that team, like @

perhaps you might consider to join them

Absolutely no chance. I'm a PHP developer, not a UX expert. Although I know when an experience is crap, I don't have all the answers on making it better.