that was not con at all.
because Youtube Bookmark was already there from the very first day. I m pretty much sure that No one made any complain against the unavailability of Official Youtube.
for integrating alexa skill with YOutube , Official version was needed. so now we can see the integration when Official Youtube is there.
for Budget oriented people (like me ), fire tv stick(normal/4k) always a decent option. I am using it almost 3 years without a problem.
specs wise Mi Box is cool. 2GB Ram plus android 9 is better option imo.
if future, Official Youtube pulls back support from Mi Box, always a workaround is there , like amazon has.
imo, both fire tv stick and Mi Box good. you can prefer any one.