OTOH, limited storage can somewhat easily be remedied by using external hard drives and online storage. I'd recommend upgrading the RAM and the processor if you plan on keeping it for a while. In future macOS versions, the extra RAM especially will probably be important for good performance.
That's a fairly subjective "solution" on storage..
For me, I can't stand the thought of having dongled up storage hanging off my MacBook Air all the time.
Only this user can really know what to do for them I suppose.
Shame they have no SD slot anymore.
That's a great way to add storage to older machines