German implementation of eIDAS will require an Apple/Google account to function 4 months ago
You should think about how easy it is to permanently lose access to your Google account for very trivial issues and Google doesn't offer any form of recovery. That in addition to the current geopolitical situation should be reason enough not to rely on that for any justification.
And personally as a software developer myself i know that nothing is more permanent than a temporary solution. No one will prioritize or give budget to change it later "because it works"