Yes they are! Plus they use higher frequencies (12.2-12.7) and they are always broadcasting at maximum capacity to make sure that all the customers get their tv delivered. Dbs is also affected by rain fade but it’s better now then it used to be in the late 90’s when it started.
it is... While is it quite powerful it's definitely less powerful than the other dedicated DBS birds. That's why they had the slightly larger dishes like the "superdish" which is about 60cm. And Dish on 121W seems to be barely used these days, I think it's mostly for specialized services (where they might be able to still push for larger dishes compared to the average DN setup)