O.k... take for example, when a few months ago, he said that Coinbase was going to support Classic XT etc...

FTFU - Coinbase said they were going to test XT...
Ok. thanks.. I was kind of shooting off the cuff.. by memory... but what you say sounds exactly correct... and much more accurate than what I said.. but my point, in part, was that Armstrong has been increasing and increasing and increasing his involvement in the debate, rather than merely making statements regarding what his company was going to do.. he is currently seeming to be involved in an ongoing battle of persuasion to convince a lot others what they should do, too... which for me is beginning to come off as a bit much and causing me desires to remove some of my dinero from their system.
Armstrong's is working in the best interests of his investors. His investors are invested in a decentralized control of Bitcoin where they can leverage there competitive advantage.
A lot of people are ignoring the centralized authoritative control over the direction bitcoin development is taking, but the fact remains as much as I dislike Coinbase there company's success is built on the success of the same Bitcoin I'm invested in.
Blockstream are working to change bitcoin in a way that will undermine Coinbase, it will undermine the Bitcoin I'm invested in. Should Bitcoin be optimized today as a settlement network their company vision and business model is dead in the water. That in its self is not a reason to not optimist bitcoin to be a settlement network. I have a preference to see bitcoin evolve organically, I think its premature to limit the block size as a stimulus to catalyse bitcoin as a settlement network. I want to decentralize financial control and totally disrupt incumbent financial players.
I want as many people as is technically feasible to settle directly with each other on the blockchain, that doesn't mean I don't want to see LN, or off chane networks, it just means I want LN or Coinbase to succeed or fail on there own merits I don't want to see anyone controlling the development direction in bitcoin to favor one or the other business models.