Hopefully it won't be long before modders fix this and add in requirements for multiclassing and bring the pre-Tasha's Cauldron stats back.
Why would it need to be modded out?
We can simply choose to put 13s in the classes we are multi-classing into.
Nothing is stopping us from adhering to the D&D rules.
Technically, you are absolutely right. But there is one 'if', that I've briefly mentioned in another thread. By making the most non-restrictive option into a default one, they are cutting everyone who wants to stick with the core D&D rules from 90% of the content in forms of guides, builds and tips that'll be made about the game. Not a huge deal for some, but I know people who are fond of using interesting established builds from the internet and they'll be forced to either adapt to the new rules or adapt the builds to fit into the core ruleset. Not an end of the world, but it can be pretty annoying, I imagine.
