"they're older; we're modern" which means what? You lack features they've had for years? You lack maturity and stability? What a load of BS, an attempt to imply superiority without the need to supply any facts.
I'm also not sure why you say that some isolation levels are stronger than others, when the truth is they're just different and all OK, as long as you understand the consequences of using them. Even read uncommitted is OK if you're prepared for what you'll get.