"before the BIAB Annual Paid User Beta Testing is completed"
LOL

I don't believe request is premature. This is a wishlist, and I have no doubts,if it will be considered (removing obsolete pickers), it will be no earlier than we will get VST3 support, which I hope we will receive by the end of February.

In my humble view, one of the biggest issues with BIAB is redundancy / unwanted and unneeded complexity that comes with maintaining obsolete and unfinished features. Previous pickers are perfect example of that. Another (from newer ones) is F8 vs Alt F8. When Alt+F8 was introduced, it should have been completed with a few remaining tools of F8, and F8 put to rest and replaced by non-modal version. There quite a few examples of that nature. New MTP Library is a big step in the right direction, given several known issues are fixed, it is pretty much complete. Why carry all the weight and scare new customers with all other pickers?
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The point of this thread is to identify shortcomings (if any) of new MTP Library compared to all previous pickers and have constructive discussion pointing developers making right decisions based of user wants/needs, not on hypothesis of what "might" happen. That is their job to worry about programming.