Against Toronto, sure absolutely. Baynes makes a lot of sense against that lineup going against Jonas while Horford takes on Ibaka. Against Philadelphia, nope, Baynes has no real shot at guarding Embiid over the long haul and Tatum would do fine on Saric.
So, sure a few matchups (and it is a few) it makes sense to start Baynes, but against most teams, Tatum will be the better start and better fit.
Someone didn't watch round 2 of the playoffs.
23/14/3.6, man Embiid sure was shut down.
How about these +- numbers.
Game 1 - Baynes -1 in 29 minutes, Boston +17 in the other 19 minutes
Game 2 - Baynes -16 in 21 minutes, Boston +21 in the other 27 minutes
Game 3 - Baynes -8 in 23 minutes, Boston +11 in the other 25 minutes
Game 4 - Baynes -9 in 19 minutes, Boston -2 in the other 29 minutes
Game 5 - Baynes -6 in 25 minutes, Boston +8 in the other 23 minutes
Embiid btw had the best +- of the Sixers starters (Redick was near him, no one else was close).
No matter how you slice it, Boston won in spite of Baynes, not because of Baynes. He was awful in that series because he can't guard Embiid. Not at all.