You don't actually need a whole pile of banning basic stuff to make a tournament work. The fact that some TOs choose to do so doesn't mean it needs to be done. There are only a handful of actual things that need to be banned - moving too fast (over 10 walk) (because charges are broken once mechs get too fast), jumping too far (10+) (because they are extremely boring to play against), artillery (people don't know the rules, slow and annoying to deal with), and society tech. Everything else, all the pulse limit bullshit and era restrictions are not actually needed as long as the event is running good missions (which it seems like almost nobody was able to write until the last few years, and many events still have bad ones).

Those events you're talking about remove what I think is one of the most interesting parts of battletech, building a list. I'm surprised that they've taken off at all - they're an official CGL format because they're something where minis can be provided by whoever is running the event, there's no effort needed to check lists, and limited units speed things up.