All of the squadmates except for Javik, who is DLC, have some unavoidable cutscene content. I'm not sure why one particular character should need more explanation or justification for their content than another.
After Garrus is on the ship, if alive, he can be avoided except a cutscene after the genophage is cured or sabotaged
Javik can be avoided after Shepard talks with him, if the dlc is completed
James can be avoided completely
Steve can be avoided
Ashley/Kaidan can be avoided after Mars
Traynor can be avoided after she talks about the retrofits
Tali, if alive, gets the cutscene before the dreadnought mission. After that, she can be avoided. Plus she's not around till after the coup
The robot can be avoided after it takes over the platform, and then shows up just before attacking Chronos
Liara has that scene right after talking with Hackett. After the first and second dream, and finally after the coup mentioning about helping commando's. The rest of the time she can be avoided
Most of the complaints I've seen about those scenes in the years since ME3 released have usually been along the lines of, "Why couldn't it be Garrus? Or Traynor? Or [insert favorite LI here]? People usually don't complain that those scenes exist, they complain that they aren't instead structured around their favorite character.
I don't complain that they're structured around anybody. I've complained why can't this character or that character, primarily Traynor or edibot pass the message to Shepard, over the intercom, that the salarian councilor wants to talk with him/her. Or why couldn't Liara use the intercom? Was it really that hard to use the intercom? Its just that scene could've been avoided and have the resources used for something else in the game
The other one is having Liara tell Shepard something that she/he already knows. What was the reason for that?
Most of the griping about dev favoritism is entirely linked to romance content and people being sore about their waifu getting one or two less scenes than some other character.
I don't know about the other romances since I don't romance them, but for Sam's romance , my one complaint was that she's the only LI that didn't get a scene on the Citadel until the Citadel dlc was released.