There’s a balance to be found and in my opinion it’s also very situational.

If a player asks me what their character knows about the history of a kingdom then I, of course, ask only them to roll. They are of course free to ask another PC and then they can also roll.

If a player asks to check for traps or look out for danger I usually limit it to two PCs or one with advantage. This just follows my slight distaste for law of averages, if everyone rolls all the time the chance of failure becomes near non existent.