From what I've seen about the TS4 devs, it's a mixed-bag, I think.
-Grant Rodiek has been around for a while, and worked on TS3. He has a habit of saying really dumb statements about the game that just piss off The Sims community. Things like
"There won't be a Sims 5 if Sims 4 flops,
as well as his reasoning for why Dog Houses aren't in the Cats & Dogs EP. (Go to 1:02:30 for the quote) Grant's cringy statements were so bad that EA took away his company twitter account access at one point, but he would eventually get his company twitter account access back. And he's still making those same cringy statements about the game.
His Twitter page is quite a read if you wanna look at it.
-Rachel Franklin, the original director for The Sims 4, had experience in mobile games, I think. She also made some statements that The Sims community did not like, including saying that not including toddlers on release was a good decision for the game. She also seemed to have an obsession with the party aspects that keep forcibly getting pushed on TS4, and the reveal for the Get Together EP was so cringy due to the dancers that were brought out for it:
At some time around after the Get Together EP was released, she left to join EA's mobile game division, and then left EA completely.
-Lucy Bradshaw was the president of Maxis going back into the 90s, I think. She was the one (I think) that made the infamous statement about SimCity 2013 originally being online-only, saying that "it's part of our vision". She also would leave Maxis and EA too.
-Lyndsay Pearson worked on The Sims series since TS2, and the buyable helicopter in the Apartment Life EP was named after her. When the community asked about why toddlers would not originally be in TS4, she said stupidly "what are toddlers?", in which the community didn't take that statement well either.
-As I mentioned earlier, Daniel Hiatt was involved with The Sims series since TS1, and was unfortunately caught up in this year's lay-offs.
-SimGuruDrake, who I think was the community manager for TS4, has lashed out at fans in unpleasant ways, I think. It makes the whole fiasco with SimMasterBurpie banning people for mentioning about SecuROM when that fiasco broke out with TS2's Bon Voyage EP seem tame in comparison, I think.
There are some other people on The Sims team that sometimes behave exceptionally, but I don't remember the details of it.