Who said anything about breaking the rules.
The part I quoted, when he said: "multiclassing is also broken..."
Seriously, do you even read posts before responding?
Stop implying anyone is breaking the rules. Stop implying someone is having issues with multiclassing because they're doing it wrong.
You keep saying "implying". I don't think that word means what you think it means.
So... you agree it can be abused then?
Saying multiclassing is optional and thus isn't required isn't the same thing as agreeing it can be abused. They are completely different things. For one, a person can simply not like an optional whatever to keep it out of their games. Abuse has nothing to with it.
You do not get to first accuse people of breaking the rules, and if not, then simply saying "don't use the rule then".
Not as a solution, you don't.
If you had suggested you could always turn off multiclassing because it can be broken and abused, that would be one thing. But don't pretend "turning it off" is a solution, as if that makes the rules alright!
If someone doesn't want an optional rule for
whatever reason, then not using that rule
is a solution. Also, like I said, just because you have an issue with a rule doesn't mean all or most others do. Therefore, it's not even a problem that needs a solution for many.
But you know what, after reading your responses in this thread? I am convinced your problems with the game are self inflicted, and rather than take any ownership whatsoever of the problems you're having, you're blaming the designers. To a comical effect no less, when you say things like you're an "overworked DM" shortly after saying you can't be bothered to spend time preparing as a DM. You must have a funny definition of "overworked". Your initial scenario was only a cakewalk because you completely neutered your bad guys because you couldn't be bothered to spend the time preparing them as a DM. So you blame the system as broken or the designers as being bad. People have given solutions, and rather than accept them, you then attack others as being apologists for WotC and irrational.
No dude. This is a problem because by your description, it's lazy DMing. That's not a designer problem. You want literally everything handed to you and done for you. And all you have been able to do when called out on it is personally attack other people either with ad hominems (calling them apologists or irrational) or with strawmen ("you're saying it can be abused").