That's right! I remember those signed drivers where also why early XP (pre SP2) had a bad rep. Not as bad as ME but users were swearing on the graves of dead relatives they would never give up W98 or W2k. Without new or signed drivers, a lot of hardware struggled but by the time SP2 rolled out, hardware vendors had mostly caught up and the OS had matured.

Vista had similar issues (so, so many issues with Vista) with it's security changes which made life difficult for badly written/insecure software (wanting admin rights to run or write access to system folders/reg keys). Those changes in Vista paved the way for Win7 to be so much better at launch since most software had caught up by then.

I think the issue with disabling components is 90% how users remove them. Pulling them out via "official" methods hasn't ever caused me issues - DISM is really handy - particularly for permanently removing the default apps. Those deeply connected functions can be a pain!