Every startup I've worked at installed GA4 on day one and then made approximately zero decisions from it. It tells you traffic is up. It doesn't tell you which signups turn into people who pay you twice, but without instrumentation, nobody has time for pre-PMF. What I actually wanted to know was which signups were worth chasing. Never got that out of GA4. Ended up with Stripe and one SQL query I wrote once and never touched again. What did you actually check in the most (least) early...