So are there already some improvements and is it worth to try to play with these or is this still a no go area ?

I just tried yesterday's Bonsai build and it already starts to throw warnings if I only expand Materials and Styles dropdowns or try a "Merge Identical" on these. So it looks like a bit of a rough terrain part of Bonsai but maybe a completely different issue though.
I understand that priority wise there may be more important areas beside my fringe group feature interests .... but if there are any news or roadmaps - highly welcome.