Apple Store doesn't have useful apps for me, I rather use brew for installation, or I need to download dmg.
I don't use Apple Music because I use Spotify with my friends.
I don't use Apple Mail because we are in the Google ecosystem, so I use Gmail.
I don't use Apple Calendar (there is such a thing?), because in the Google ecosystem I use Google Calendar and - for notifications in the tray - Notion Calendar.
What do I lose by not using Apple ID?
Any company that has designed their security well doesn't have to fight the FBI because they have no data to give them. Apple's iCloud copies encryption keys for your data, giving Apple a backup decryption key that they can very easily give to any fed (and likely do already in FIVE-EYES/Chinese jurisdictions).
Private technology isn't dictated by relativism or dialectics. Treating your security like this is simply how you get hacked - I wouldn't trust Bitlocker or iCloud to protect my data because both are objectively backdoored. It doesn't matter how many San Bernadino publicity stunts the parent company arranges, you would look like a moron using this same line of logic to defend Microsoft or Google.