I would be in favor of 1) only if, there would be more unique playstyles, and PDX don't have a very "unique" vision of some ethics. F.e., in yesterday DD it was clear that Spiritualists should go down Psi path. Authoritarian should go on conquest, etc. That Authoritarian paradise is impossible, it would be a s***hole no matter that. That Xenophobe are supposed to be ruthless bigots. Instead of combining ethics, traits and traditions to support each other and balance out weakness of particular build, we just select a path we want to follow, while ignoring things that aren't a part of selected path.
You're basically arguing that you agree with the first premise while also wanting the second mutually exclusive one to be true...
If some ethics have unique selling points which other ethics can't access, of course it's going to feel like that ethos is 'supposed' to use that feature. If these distinctions didn't exist then there wouldn't be anything meaningful to distinguish between them (as the game is currently, where your ethics choices basically come down to "do you want robots" and "do you want to choose one of the 2 ways to effectively counter ethics divergence")
Re: the OP, I hope each ethos has at least one thing which makes me think "that is super cool, I want to be able to do that!". Psionics and robots are already there, I think the different factions will also play a big part in this (some factions being easier to please than others...) but I don't really care what kinds of features distinguish between the ethics as long as they're meaningfully impactful on the game and preferably have some cool flavour which makes them feel like a reward.
As an aside, I'm kind of interested to see how fanatic ethics are balanced now, as the stream yesterday showed that they only receive double bonuses compared to 'single' ethics, as opposed to triple bonuses in the current patch. I assume that the benefit of having more ethic attraction towards a single ethic, and the resulting ease of handling your most influential factions, probably plays a part in this.