I agree with you alot, but the division isnt necessarily a bad thing.
The players with alts generally play for fun and are not to concerned with all that power and will continue to play that way with like minded people. Key is to not get sucked into being a lackey for folks in the other part of the division.
The players in the other part of the division are SSG’s goldmine, they are the ones so heavily invested that each new investment that comes out must be acquired to maintain pace, their investment is so deep that to leave will mean that they waisted all the investment they have already spent, this being the singular reason as to why they are the goldmine. I would hazard a guess that SSG has meetings with the sole purpose to figure out how to mazimize this without breaking it.
I have many alts, I play for fun, but I'm also a power gamer, and I'm not ashamed of it. I have several characters with a lot of PLs and pretty good gear. I'm not desperate to get the top bonuses, but I do like to get competent characters who can not only play their roles well, but who I can play fluently solo.
I've paid for a subscription and the highest tier of xPacks because I believe that work should be paid for. But I'm not an idiot. I'm not going to get scammed and pay thousands of shards because they're going to implement a predatory loot mechanic, nor am I going to buy Otto boxes because I desperately need PLs (heh, I actually get a good amount of store points with each toon).
So no, you can't generalize by saying that alt players don't care about power. That's not the case. Many people I play with have a supermain, take care to keep it up to date, and have a few weak alts they'd like to improve, if only SSG didn't make the goalposts so far away. Thinking people are going to spend non-stop in Ottos or other boosts on their alts is pretty naive for SSG part. Most people don't spend much on their alts because SSG has set the goalposts too far out of reach.
And we all play for fun, really. It's just that not everyone finds the fun in the same place.