Not gonna slog through 18 pages, just relate my own experience. Some years back, I had a job where I had plenty of downtime at an on-grounds site. Kept an old early 2008 Mac Pro that was replace with an iMac, but for a 'home away from home' computer, it did fine. Eventually (probably close to 10 years old?), having had a few glitches along the way, it pretty much died. Picked up 2017 12" MacBook 8-gig RAM/512-gig SSD from B&H Photo & Video for a grand on sale. Bought an ornamental protective shell covering for it. Here's what this little bugger does:
1.) When I had that job, I hooked to an external 27" monitor with blue tooth keyboard and for casual web surfing, etc..., it worked just fine. I learned that having a bunch of browser tabs open and some apps in the background could bog it down a bit, so don't keep too much open at once.
2.) Since leaving that job, it's a small/compact and light notebook that fits in a backpack pocket nicely when I travel. This is handy, because the software I use in place of Quicken (crap on the subscription model, I switched) doesn't have a Mac version. Handy to take notes, send e-mails, etc... I have an iPhone 12 Pro Max and a 2022 M2 11" iPad Pro and blue tooth keyboard, but for some things the notebook is nice to have.
3.) When I hang out in our kid's room, I can hook it to the USB cable from the 27" Philips monitor in there and web surf on a big screen.
None of that is going to work substantially better with an M-series MacBook Air, etc...
A key factor is that the notebook isn't my primary computer. My primary is a 2017 iMac 27" whose Fusion Drive went out so now I'm running it with a Samsung T7 external portable SSD USB-C drive, which oddly enough seems to work a bit faster than the internal Fusion Drive did.
Neither machine officially supports the latest Mac OS, but hey, Ventura's fine for me. They do what I want done. If I decide to pour money into a new Mac, I'll want a new desktop Mac because that's where I do most of my Mac activity.
The budget doesn't smile on several hundred+ purchases that have little practical impact.