Chilled alliance (Marvel Black Ops), that prioritises cooperative gameplay with minimal ask, and an assumption that players will play most days, with a reasonable degree of intelligence and independence.
We don't use any external messaging like Line, Discord, etc.
Most players are in the region of 6-8 million rating; with a few accounts above and below that.
We run Map 6x4 in AQ, Monday-Friday; and participating is basically the only thing we expect/chase people for; since Glory is still a fairly substantial reward currency.
War is completely optional, with two BGs currently in Gold-6. There's an expectation for diverse defenders if you're playing, but we don't make your choices for you, or set paths (you can choose your own in War chat, if you want).
No BGs requirement, but enough of us play regularly to get decent Alliance rewards (I think 11-20% bracket, last time).
We have been running Raids recently, and taken the same approach as we have for War: now that we've got the basic principles of it, we assume people are competent players who can read nodes, and choose paths for themselves, without a need for instructions (but, help and advice will always be given on request).
So far we've found it works pretty well; completing the vast majority of Raids with a bit of coordination in the in-game chat.
Message me on here, or look me up in game: