As Eryk says, the defaults include the "py" launcher, which is now recommended at the end of installation. Python is also available from the Start menu/screen, and PEP 514 allows other tools to reliably detect and offer Python installs.

Modifying PATH at all is an advanced scenario, as it may cause other (unrelated) applications to stop working. Modifying PATH twice makes launching Python unreliable, and attempting to reverse the modification may leave the system in an unreliable state. We won't be changing the default.

People who install from the Microsoft Store will get all the shortcuts they expect (assuming they are already Linux experts, otherwise they have no expectations anyway), because we are able to update what appears on PATH more safely.