Sure but that's just one example of something that can get put on chain.
Also, genuine question, does lowering the op return limit difinitively make it impossible to put something like that on chain?
Discussion
Think of it this way, right now there is one main way to put bad stuff on the chain. We will call it route A (the hack from segwit) it is cumbersome, expensive, takes a high amount of skill. The op_return limit raise is adding a brand new route for bad stuff, we call it route B. So now there are two routes for bad stuff and route B is wayyy easier to get bad stuff on the chain.