Yes, that's what I'm pointing out, even the tutorial video shows you have to tap the tempo. BIAB should just pass the tempo on, this is fairly common for host applications.

If you change the tempo in BIAB then it looks like you need to bring up every VST and re-tap the tempo.

I wouldn't say "common" because only standalone apps or the hosts themselves tend to have a tap control. BIAB has has a tap tempo - but it doesn't pass it on.

I see lots of midi improvements, maybe this will make the list some day?