I'm on the market for a decent laptop. Don't want to side-line the thread, but is Arch supported decently on, say, Dell or any "enterprise grade" laptops?

Short answer to a pretty broad question: Yes

More color: I was happy running Arch on a 2012 vintage Dell Latitude (Intel, integrated graphics) for several years. I'm currently quite happy running Arch on a Lenovo Thinkpad T14s (gen2, AMD, integrated graphics).

Arch wiki does have many pages about arch-on-a-particular-model to help once you get a short list of models you're interested in, like this: https://wiki.archlinux.org/title/Lenovo_ThinkPad_T14s_(AMD)_...

I haven’t tried much, but as long as you avoid nvidia or fancy laptops with weird components, you will be good. My recommendation is to go for business line, as they have more standardized peripherals. Better if there’s some linux support guarantee.

If in doubt, search the Arch forums for posts about the model you consider to buy. Best case: Some threads come up, but all problems could be solved. Worst case: No threads, or a lot of threads about obscure errors.

I have a Dell Vostro 7620 currently running Arch. Even with the Nvidia graphics card I have run into very few issues (only once did a nvidia driver update did break the system), so I'd say go for it.