I've recently purchased a used T530, which was the last model to feature a removable battery, removable CPU, unsoldered RAM, etc etc(for the pedants - yes, later models still had some of these features, but none of them had all of them). It's a fantastic machine that runs everyday tasks without a hitch and with having the option to easily repair it I hope it will last at least another 10 years. The only disadvantage I have compared to the newer T490 model that I use is that it's about 1kg heavier.
I think it's reasonable that some consumers would prefer a lighter and thinner machine, even if that includes sacrificing modularity/repairibility, but I doubt those make up the majority and most are just apathetic and willing to go the way of disposable consumerism that corporations are pushing to drive profits further.