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As someone who works in IT an always online MacBook is nice. As it is it causes a few problems when you can’t connect a not signed in MacBook to a new wifi network. Makes find my obsolete for laptops unless the person who finds/steals it goes to wipe it and signs into wifi on the recovery screen. For support this has other implications because it means we have to physically have the machine or tell a user our admin account password if they get locked out in a place they’ve never been. There are plenty of other implications this has but for business users on the move it would make my job easier.
Just have a few good practices and you should really only have to buy harddrives when they fail. I have drives that are from 2008 that I only turn on when I want to go down memory lane.
Have a few copies of your data. Original, backup, offsite backup.
Backups have parity or redundancy so if a drive fails you can replace it without completely rebuilding from backup.
Not all drives are from the same batch. This one’s more up to chance but if you get a bad batch of drives they will likely fail around the same time so it’s best to get them in groups if you are buying drives in bulk.
The only thing I notice about older drives is the speed. I would say the real reason most people constantly buy new drives is capacity. I could go out and double my capacity if I just replaced all my drives with 20TB drives. I have all 8tb drives in my setup but I plan on buying 16-20TB drives when they start to fail.