Outside storage has advantages, and plenty of disadvantages. Loss, forgetting to keep it, security issues of plugging, probably more.

It's not good or bad. It's just a choice, and glad that I have it. Just got a new phone with 64GB, but it does have the SD slot, so I added 128GB. Hoping that ensures I don't run out for the foreseeable future, but there was a time when I thought 32GB, then 64GB was plenty.

Just like 640k used to be fine.