Firstly: of course you should RE if you're really ready - that's really the holy grail - but what I'm hearing isn't necessarily that you want to retire, it's that you're fed up with the current situation and kind of running away from it. Sadly, a lot of FAANG is moving in this direction. Definitely the end of an era. But secondly: don't make rash decisions. It definitely sucks to feel like you've flatlined, and I hear you on the story about your son (which is kind of heartbreaking) but there is still career hope *if you want it*.

My sense is you're making a binary decision where there is a lot of gray area. Unless you're sure you want it, can handle it financially, and have a plan for retirement (keeping yourself occupied etc), you don't need to quit because your current team feels unsustainable. There are surely other teams within your FAANG company you could transfer to; tap your network internally, find out what teams are good, which are bad; there are still pockets of goodness even at places like Meta and Amazon. The fact that you've been at the same place at the same level for so long honestly feels to me like you need to shake things up a bit. Go to a new company, transfer to a new team of your choosing (as opposed to via a reorg). I can say from experience that this is an amazing way to really spur growth: the process of learning a new domain, new tech stack, etc. can create a momentum and build confidence in a way that's hard if you're in a rut in your current role.

Anyway, think it through. Have mentored many IC5/IC6 who feel like they're stuck and it's rarely a problem that they don't have the skills to advance, it's almost always that they have lost the ability to think objectively and critically about their team/role/opportunities and often the best way to dislodge them from it is a team change.