If you look at The current situation with ThinkPads it's obvious why no OEM would want to end up where Lenovo is now. ThinkPads built a decade ago are so durable and well-built with readily available replacement parts that they will most likely never go away entirely. CPUs haven't improved enough to make them a compelling argument for upgrading, and the end result is that modern day Lenovo is stuck competing with its own product.
Those Thinkpads were built by IBM. Lenovo took a stallion of a brand and drove it face down into the ground.
I tried to stay with Lenovo, but after the endless waves of shitware, spyware and low quality hardware (!) I had to give up. Thinkpad’s great name is thanks to IBM, and perhaps, maybe, a bit of early Lenovo. Maybe.
If Lenovo is competing with anything, it’s with IBM.
The Thinkpad T440 and newer are easier to work on than the T400 thru T430. You can do a heck of a lot more while removing fewer screws. than in older Thinkpads.