Beware of youtube videos about connecting 2 compressors together

I’ve done this with two simple/unsophisticated compressors with tanks and interconnecting them with a flexible air line. Each compressor shuts down when it’s pressure switch shuts It down, but the other runs and charges both tanks until it too shuts down. Neither compressor has an unloader. Both are protected by pressure blow-off safety valves. I also added in an additional pressure tank too. I’ve been doing this for years.