I think updating all to FAB have 1 reason - to IMPROVE all that was earlier.
But WHERE is function that all devs needed?
Where is filter for UE version? How i can see is for 5.3 or 5.2 only? or maybe this supports new version?
When you have 5 assets this is not a problemm, but if you have 100+ assets - you cant understand what is working on your engine version.
My opinion is - if we will not see this in FAB - this will be FAIL.