As someone who only uses default kde settings: no!
This is the type of change I wouldn’t notice until a default created UX friction, and not being able to fix that change would drive me away from the DE. Having the option to hack at something means i can use it for much longer without concern.
Worries around this seem a bit much. They are making an experimental version of the protocol so they don’t need to sit on their hands while changes are accepted. They’re not bypassing the normal process.