I’ve started playing with esp32/rp2350 based boards that have everything in the same form factor. The only thing missing is a fully waterproof enclosure (they expose the back pcb). And vibration motor.
that could indeed be an option depending on your use case. The problem with those (aside from finding a suitable enclosure) is that while more powerful, they aren't at all optimized for use in really low-power conditions and that their energy consumption is consequently enormously higher than that of e.g. an nRF52 (e.g. nRF52832 or nRF52840), so that the battery time would likely be significantly shorter.
Regarding power I agree - a weeks worth is hard to get. inside i don’t mind plugging in power and outside if a lipo battery can last afew hours (while jogging etc) I’m good to go. Also these cpus have very good sleep modes.