I thought about this recently, 20 years ago when the E46 M3 came out it was rated at 3,450 lbs. curb weight for the US.
If you get a manual non-sunroof M2/M2C you should be mid/upper 35-- lbs. range. So 100-150 lbs. gain over 2 decades doesn't seem really all that bad to me. Look at the weight gain in the previous 2 decades (1980-2000) and it was far worse for most brands.
What makes me laugh though is that my E39 525i has the same curb weight as the E46 M3...so it weighs less than a M2 even though you would never suspect that with its dimensions and Titanic slow steering rack
Kudos to the aluminum front/rear subframes and suspension components.