I have an iPhone 11 Pro 256GB. I have over 120 games, keep original photos and videos, and use ~109GB. Even if I turn off Keep Original photos and videos, I will still use ~50GB. I hate Offload Apps, so I don't use it. I also hate managing my storage. So 64GB isn't enough for me.
Answer on the poll.
Its plenty for me! But it depends on what you are doing.