First part hell no second part hell yeah. I wouldn't want to deal with current equivalent of Android 2.3 or 4.0.4 or eMMC failures or 5 minute bootup delay from battery insertion to first shutters with high end $1.5k cameras.

What's needed is USB-C host on iPhone. Then USB MTP or MSC to extract and upload. Which, is arguably already there. I think what's really missing is iOS/Android side willingness to ingest offline files.

You don't need Android for that (thank god).

There were cameras with FTP or WebDAV support, when connected to WiFi. I guess it’s just not really popular?

Ironically, Android started as a DSLR OS.