Its not the end of the world if a card does hit (especially if its a more reactive card: reactive cards are generally safer than threats in eternal formats), and when you make nearly 200 new cards you expect some will at least intrigue Legacy players
The biggest obstacle to its return is that its a little tricky to design finding effects that work well with it and are balanced is already tricky, and it requires a pretty spell-heavy environment
This means that you will move directly from the end of combat step of one combat phase to the beginning of combat step of the next one
Somehow, that doesn't seem fair
The most recent cycle of Incarnation creatures debuted in Modern Horizons 2, and those creatures blew the doors off their past kindred creatures, as they featured a free evoke mechanic and immensely powerful abilities tacked onto strong, fairly inexpensive creatures
That lead to me ignoring the Vampire typeline, except the vast majority of great Boros cards have three power