You've come back to this point several times, and for some reason you seem to really believe that an increase in the physical blocksize limit is actually necessary.
Agreed, its not necessary. It may be a good idea to help keep fees very low for the next few years. I do not particularly care about this issue that much, however I do respect some people who think low fees in the short term is very important.
then why make two changes simultaneously?
It can happen after segwit