There aren't any public Teams like that since, you can't join by link etc. as guest. There is are some community lead Teams in Teams like that, collab365 has one, but I always prefer people use the actual office community for questions etc. due to more eyes on things. Some people ask for help on items there but tbh, I don't pay as much attention there.
Yeah I kind of agree, but splitting people around in all these silo's isn't the greatest IMO. If only everyone would agree on the same place. That's why sticking to official Microsoft location is where I'm at, and I dabble elsewhere, but always redirect questions people have not getting a good response to the community.