I think you missed the key issue. Mining is largely centralized under the control of Bitmain, both via pools and indirectly via miners they have sold (which in the past have had backdoors). They profit from using an exploit called ASICBOOST.

Segwit will disable ASICBOOST as a side effect of improving the protocol. Therefore, BitMain has been launching FUD campaigns and numerous attempts to propose alternative software to stop segwit (XT, BU, BTC1, BTCABC etc.)

Segwit2X is a compromise-- but Bitmain does not like it because it activates segwit.

So BitMain has announced they plan to do a forcible Hard Fork of Bitcoin, splitting off into another chain, that they will privately mine-- and they intend to neutralize segwit on it.

They have publicly complained that segwit offers lower fees for transactions that use less resources.

The entire conflict (including the "scaling problems" which have recently been proven to be due to spam driving up transaction costs) is Bitmain attempting to increase and protect their near monopoly.

Please be aware that their fork, which will have nearly unlimited block size will increase their monopoly. Due to the great firewall of china, large blocks have trouble getting transmitted, so whenever a chinese miner finds a block, when the blocks are very big, they have a significant competitive advantage in finding the next block. Thus simply activating a spam campaign (which they have been doing the past 3 months or so already) will allow them to centralize mining in china because the chinese miners will start getting 2-3 blocks ahead. Further on their hard fork they can easily lower the difficulty and get many blocks ahead while private mining (but make it look like the difficulty is higher) -- admittedly a speculation but given their past exploits and announced plans to engage in further shady behavior I would not be surprised.

Here's the blog post where they announce their (very sketchy) hard fork: https://blog.bitmain.com/en/uahf-contingency-plan-uasf-bip14...