By memory, I believe you mean hard drive space. Memory and storage are different things, but I completely take your meaning.
And I don’t disagree with you. I have a 3 TB NAS in my office for long-term storage and bulk storage of music and system backups. I’ve not even used 50% of the total space.
In an enterprise, however, storage is a big dollar IT expense and the more you can cram into a smaller space for a smaller price, the more will be purchased.
Nope, the storage space is solid state according to the documentation I see - no moving parts at all except the keys on the keyboard. I don’t recall off hand what the usable instant memory is but it is substantial. It is ridiculously expensive, but I didn’t pay for it.