My D (a vocalist) only did a bit of piano…even though we encouraged more. She did play violin for quite a few years in elementary and middle school however…so that took time. Once she started true voice lessons, she was constantly in shows (with some dance lessons) so piano went on the sidelines.
She did have to take a piano placement test (after acceptance). She only passed through the first semester (of 4 required…I think). So she did have to take piano in college. If I remember correctly it was 1 credit course (P/F) and did not take up a lot of time. Still it’s another thing to fit into your schedule. I thought I would get a fair amt of complaining…but she seemed fine with it. And…she now plays piano quite a bit…for teaching voice lessons (although she can use an accompaniment app…which is usually what she does, I think) and just to work on her music for roles at home.
Just another “experience” to add to this thread.