Is, in principle this possible - sure.
I would suggest based on past history that you should expect this extra data you have opted to share to leak in ways big and small, from the individual leak, to wholesale compromise of companies databases.
You should expect inadequately tested rolled out drivers to brick certain device configurations until someone skilled can fix it.
You should expect the 'automated' things to be increasingly harder to fix if that automatic service goes wrong.
Increased opaqueness to the general user - random changes in user interface to hide or eliminate features which 'most' users are not using.
And all other sorts of things.
Microsoft et al do not care about the 10% of users that this may make things awkward for - they care about the nebulous users that it may win, or retain by simplifying and making their lives easier.
The few for which life is made hard or impossible - well - maybe for a few months you'll be able to find ways to revert to the old behaviour.