Being soldered on is a huge issue to 99% of people and businesses wanting to repair or upgrade something.
I don’t have the tools or skills to replace soldered on memory chips when they fail. Nobody at my place of work does. Nobody was doing that type of work in a warranty centre I worked in either.
I’d need to buy an entire motherboard which will much more expensive, and likely more time consuming, than swapping a couple of memory modules.
It's not about 99%, but enabling an industry of skilled repairers to do it for you for a small fee.
99% of people will not be replacing the USB-C port, they'll just bin the device and buy a new one or live with a dead port. So the effort is 80% PR 20% actual usefulness.
I keep purchasing ThinkPads (Z13, X1 Gen 11, X1 Gen 12, T16) where the USB-C port breaks within a year (respectively: "no dock or external monitor", "no charge and only non-Thunderbolt enumeration" on a single port, "charge only, no USB enumeration at all" on both ports, "fries other devices during reverse PD"), and I'd love to be able to swap out a broken port rather than ship the entire machine to Poland for two weeks and get lectured by the support contact that, "maybe ports only stop working under Linux but we'll still repair the mainboard this time."
I am waiting to jump ship to a different manufacturer, but nobody is challenging ThinkPad on keyboard quality/layout and Linux support, the two factors where I'm totally unwilling to compromise. (Tuxedo is close but still not the better alternative.)
In the almost 30 years of using Mac’s at home and various desktop pc’s in the workplace I don’t think I have ever seen ram fail. Replaced plenty of old school failed disk drives however.
Failing RAM is rarer than it seems from posts online. My theory is that it's so easy to test for that everyone says to do it even if it's unlikely to be your problem. It reminds me of people who needlessly recap (replace capacitors) everything in hopes of it fixing a problem, often not even bothering to test each cap or exhausting other options first. IME dirt/corrosion/oxidation (often solved by cleaning) is a much more prevalent problem than bad caps. After that, solder that needs reflowing is still a more common issue than bad caps.
That being said, I really did have one bad stick of RAM once in my life, and it really does cause strange seemingly random problems.
I think it is less of a concern to the businesses buying these things brand new and more of a concern to the tinkerers who buy/repair/resell/use older models. There's a lot of people who still use ThinkPads made in early 2010s (and earlier). I had RAM module fail on an x270 and replacing it only required opening the laptop (RAM sticks just snap into place). If soldered-on RAM fails, it's game over, or at least full board swap.
Plus, no way to put more RAM/replace RAM with larger module if it's soldered on.
Lucky. Working in repairs I was only seeing the ones that didn’t work, and I’ve seen failures of just about everything. It probably skews my experience.
One time upgrading workstations, 4 of the 20 Corsair kits were sent for RMA. Those aren’t great odds.
I would guess that soldering them to the board reduces the points of failure, the slots can and do fail. However, I’ve also seen soldered components coming off as the cause of failures, but it is usually a part that gets hot combined with a design flaw.
I don’t have the tools or skills to replace soldered on memory chips when they fail. Nobody at my place of work does. Nobody was doing that type of work in a warranty centre I worked in either.
I’d need to buy an entire motherboard which will much more expensive, and likely more time consuming, than swapping a couple of memory modules.