So those who really require the function of the "pro" cpus are not "professionals", but rather users in the enterprise environment?
Yeah, understand that thinkpads usually last longer and ease of repair, and thats mostly because of its construction. Some thinkpads are using consumer grade CPUs also so I think has less to do with the CPUs inside though haha! Might be wrong :x
Well, I guess it depends on what they order, and what they are supplied with by the chipmakers. But I'm sure they wouldn't want to put lousy chips into their products gazetted for a certain demographic - it causes a lot of problems for them in the long run, and the loss of enterprise customers is damaging to any manufacturer seeking to serve this client base. Word gets out and makes the problem worse (because IT professionals talk among themselves).
Just think on the oft-reported coverage of why Apple ditched Intel chips, as revealed by a former Intel engineer, and you can see how damaging such articles can be for trust in a company. When companies buy laptops in the tens or hundreds (if MNC), it's far more damaging than in the single-digit (usually 1) that end-users typically buy.
In fact, you can probably go as far as to say they do not really mind the loss of end users as much as they do corporate/enterprise customers. It doesn't hurt them as much.
As to the argument of construction, we have a real life example right here of a trackpad on a consumer class laptop that is misaligned. Send one of these obvious flaws to a corporate client who might be deploying it to senior management/division directorate, and you can be sure that there will be trouble. The longevity of this class of laptops also points to quality internals - they won't be lasting 5-8y if there were bad components within.
Also, the default bundling of 3y of onsite warranty that is typical of enterprise class devices is another good indicator. You only need to look at the Dell Latitudes/Precision/Vostro, or the HP Elitebooks, and you can see the 3y warranty, with the option to extend to 5, is pretty standard across the board. You wouldn't put a long warranty on products you do not trust to last that long.