fid02 the fact remains that IPC exists and metadata is also data, sometimes contextually more important than actual data which is by default protected by app sandbox and permission control.
When weighing options within security and privacy scopes, I would always choose the better option, unless their objectives clash. Then I would always choose privacy first. There are always alternatives. I already use GrapheneOS hardening to maximum reasonable effect.
Last but not least, remember that Google ecosystem was not developed with your best interests at heart but theirs and only theirs so for that purpose you don't always need to run to their defense, they don't need it and they tirelessly work on new methods of implementing tracking technologies that would, surprise, work to their advantage.