I think Thinkpads are actually quite fine for user serviceability, although I do find it was much easier to open my old HP Probook than it was to open my Lenovo P1 gen 3. Lenovo had me dig for a whole bunch of screws and tabs to pull off the bottom panel where HP let me access all the important parts with just one screw and a slide-off panel.
I'm not familiar with current ThinkPads.
the whole "it's modular! here's your screwdriver! you can service your laptop by yourself and replace the ram! don't forget your coveralls, you're a hardware technician now!" thing seems a bit.. theatrical? but who knows, i've never owned a laptop with fixed storage and ram so maybe i'm not in the target demographic. also, who knows, maybe their inverted dongle thing will become a standard?
i've always just used thinkpads. they do a pretty good job of picking the right ports in the right quantities and have almost (excluding the ultra-ultralights) always allowed for replacement of ram, disk and sometimes have had a modular bay for cd-rom/dvd/additional disk/etc. quality seems to have dropped a little recently, but overall, still decent.
That'd be true for laptops from 3-4 years ago. That's also what I thought about framework until I saw the recent crap Lenovo etc. are pushing in consumer segment. They have basically tablet motherboards. Everything else is soldered. No ram slots, no sata, no connectivity, only a single M.2. If you're lucky it'll have 1 ram slot. This'll only get worse and spread to all segments.