While I see the convenience in dropping a lot of patches the better approach would be to add something like python-is-python3, for the ones that require it.
(meta-webkit does provide it already https://github.com/Igalia/meta-webkit/blob/main/recipes-devtools/python/python-is-python3_1.0.bb).

Adding a link by the base package and recommending to the user to remove it again, would create two very unwelcome situations.

a) it will clash at image assembly with an error message that will no easily point to the python base package
b) create a need to run with a permanent remove operation on top of poky (creating the need for new sstate cache artifacts)

What I could see is to move the symlink into an optional package, which could be used by the few recipes that still use the "wrong" interpreter line via RDEPENDS, that would be the much cleaner solution here