Why do you need SD cards? Phones come with 128Gb of storage now, and pixel devices come with unlimited photo backups to Google Drive.
Unless you are downloading a shit ton of media you will never need it.
Even Google Play Music doesn't suck up that much space with offline playlists. I have a 500 song playlist for weekend camping - and it uses a whopping 1.5-2Gb of space (1Mb per minute X 3 minutes per song X 500 songs)
Even with every photo I've ever taken, I'll never ever fill up a full phone worth of data.
Phone storage "space wars" is no different than pixel density wars. At some point it becomes pointless to add more with no actual benefit.