I have a 128GB SE, which has about 30GBs free. I would have gotten a larger size storage if it was available.
I probably could have delt with the cheaper 64GB SE, but I didn't ever wants to deal with having to delete stuff when I run out of storage.
I'd imagine there are many other iPhone users that felt similar. No matter if they are shooting 4K video, storaging large amounts of media, playing a lot of games, or taking lots of photos, it is nice to not have to worry about running out of space.
With Apple devices, you can never have too much storage, but there are plenty of people out there that had to deal with having too little storage.
Most people probably don't even pay attention to their free space, until they run out of it.