1) All screens have unevenness, some less (Eizo) some more. Forget the exposure meter, it's your eye that counts. A half stop sounds within reason, it's right on the limit to what the eye can see, if I remember correctly. I've heard of no such complaints one the 24" iMac, but yours may be an exception. You have to compare it to others to know.
2) A TFT is sharp, a CRT is not. That's why you didn't see the stepped lines on the CRT.
3) I haven't heard about that either, but a TFT is slower than a CRT. You'll have to compare it to others.
AC4.1-AC26SWE; MacOS13.5.1; MP5,1+MBP16,1