I'm going to downvote you because I don't know what you're talking about. My kids have 128GB phones and don't have any issues at all. They're also on our family plan with Google One for shared storage and we're still -- as a family of five where I personally have contributed about 100,000 photos (and some videos) over the past 15 years -- only at 1.2TB of consumed storage.
What are your kids doing that consumes so much local storage?