Probably they realized that B2X would and up being just another altcoin due to the lack of support from the Bitcoin community in accepting the SegWit2X as the real Bitcoin chain.
I think that's is very important, because it will make Bitcoin stronger, and no one else will try to change the Bitcoin protocol without consensus of the community. Miners and a few exchanges and other companies are not the owners of Bitcoin. Of course Bitcoin needs to chance, but block size is not the most important thing in Bitcoin, it is its decentralization feature.