I am in a similar predicament and heavily conflicted. Mid 30s, at FAANG, making ~$1M/yr liquid for the past few years, a net worth of ~$5M liquid in Vanguard ETFs, and have an offer for a very popular AI "startup" you all know, and I am not able to understand if the risk (illiquidity of my offer) and quality of life hit (longer hours, worse commute, higher stress) are worth the tradeoff.
On one hand, I am thinking that I really have no choice other than joining the opportunity presented in front of me, life in tech is either a constant uncomfortable growth and grind or I'll be left behind, there is really no "let's keep my current situation constant in my relatively cushy role".
On the other hand, I am so tempted to not disrupt my life until an external force does it for me (layoff etc) because things are, relatively speaking, going well for me.
Finally, since you mentioned seed etc, I would never, right now, start my own thing, but that's just me and my current circumstances.