I mean I've got all my photos I've ever taken, I take videos in 4k, all my music downloaded in lossless alac, and I've got plenty of space on my 128gb pixel
My music library alone is nearly 280GB, and all the pictures/video I've taken are over 450GB. No way I'm fitting all that into 128GB. That doesn't take into account any media I want to watch offline, or any games I may choose to load onto my phone.
This is why I like having an micro SD card slot (and headphone jack) and don't like that if I upgrade to a Pixel, I'll lose it.
I do offload a lot of it, I have my own server, I run my own streaming service(s).
But I like keeping my music library offline for scenarios when I don't have internet available. I don't really keep my photos all on my phone.
Of course, Google would love it if I offloaded all my stuff to their cloud and Google Photos and such, and paid for the privilege instead of hosting everything myself or having an SD card.
I just think 128GB is a pitifully small amount for anyone with any significant amount of media they want to carry.