When would you define as “before”? I’ve had a thinkpad on and off and I’d describe the quality as consistent.
People talking about old Lenovos being good quality are often talking about in the pre-IBM days which is far more likely to be nostalgia at this point.
I've used Thinkpads consistently for 25-30 years, and still do. I can't really draw a line between "before" and "after" but if I take a long enough period I can definitely see differences in the experience getting watered down or generally worse, from less flexibility to lower reliability.
I still have and regularly use a fully functional X200, somewhere in the box I have a fully functional T42 and an R31 whose only defect is a small screen blemish caused by me closing the lid with something on the keyboard.
But my multiple X1 Gen1 and Gen2 all have various failures (screen, battery, webcam, or keyboard), my T450 has big battery issues, my T470s have screen/GPU and battery issues. T490 is fine for now, X1 Gen11 has crappy battery and is overheating from the get go. These are different generations, different lots and still affected by the same constant issues.
My first ThinkPad had terrible battery life. It was a X1 Extreme or something like that, pretty high end but the battery was useless. Even brand new it wouldn't last an hour off leash. Also couldn't use usb-c charging from the monitors at the office, had to be plugged in.
Also the Fn key is where the Ctrl key should be, which is endlessly annoying as a user of different laptop brands.
I definitely know that people have complained that modern ThinkPads are not as good as before, and they have been doing that for ages, just as Socrates back in the day already was complaining about modern kids and their behaviours ;-)
In this case I was referring to post-T480 ThinkPads which have soldered memory, and no longer have hot-swappable batteries or on-board Ethernet.
Not sure what GP means but I gather the x230 era (2012?) has a cult following. I picked one up a few years ago when a laptop died and I didn't have the cash for something new: it is still my daily driver and I'm not replacing it til it dies.
By contrast, I know someone who got a T480 second hand and it lasted six months. My guess is the 2012 era was when the change happened
We had an expensive IBM ThinkPad model (too long ago to remember what model it was) and the keyboard and several other parts were worn down in three years of mostly in-home use. So ¯\_(ツ)_/¯.
At least a lot of modern ThinkPads are still modular. Recently got a 5th gen T14 AMD. Memory, NVMe SSD, WWAN modem, battery, and a bunch of other components are really easy to replace. I think I prefer the keyboard over my MBP, it feels less harsh.
I have a T420. A few years ago I switched to a slightly used T480, keyboard was a huge downgrade and the whole series can get really stupid USBC issues. After half a year or so it didn't dock anymore and I got an X1, basically the same laptop glad I found it without touch and the 'bright screen' because the screen is barely good enough, keyboard is the same and USBc already started to get finicky.
Meanwhile my T420 still runs like on day one (which was already 5 years old when I got it, and travelled 1+ years with me in a backpack), the screen works in direct sunlight and it's not even the best of its series, hardware still perfect. Fat SSD + 32GB Ram and you can barely tell how old it is.