The new fairphone 5 came out, it looks cool but the price is really, really high..
If it's a phone that can really last 10 years it could be good, but is that true? Is it worth it? I could get the one with /e/os from Murena because i want a degoogled phone with a bootloader locked, but is it usable on a daily basis?
Depends on what you're using the phone for. Personally, my usage isn't very demanding, so having a phone that's going to have security updates and a replaceable battery will probably let me use the phone for 5+ years.
I probably won't keep the phone for 10 years, but it means I can upgrade on my schedule, not just because some company decided for me.