vagr thank you very much for all your explanations and recommendations!
Yes I'm of course already using Apple ADP feature, I also tried to use the Lockdown Mode but it was unfortunately causing too many issues on my iPhone with apps like Standard Note not opening anymore.
On other forums I saw a lot of people saying to completely get rid of all Apple devices, which was a bit discouraging as I really need my Mac & iPad for my studies. I spend my whole day on it (outside my studies too). So your comment helps me a lot :)
vagr We all have to take it slow. Identify the right apps, services and get your priorities rights, at least that's what I did and GOS worked for me on my second try.
Yes exactly, I try to find the best balance between practicality and privacy to ensure that I can keep the same setup over time, while improving it little by little, without giving up all at once because I've gone too far or too fast.
When I will buy a Pixel to use GOS, probably in the next few months, I'm thinking of keeping my iPhone with me (in a bag pack), simply storing it in a Faraday bag too, to make sure I still have it available if I need it.
Regarding apps and services, I've tried to do my best by giving up all iCloud/Google services and now use Tresorit, Ente, Proton Mail/Calendar/Drive/VPN, Standard Notes, Obsidian, DeepL (paid version to avoid training on my texts), LanguageTool, Brave, YubiKeys, Signal, Organic maps (when I can), Revolut (for their ephemeral/virtual card function for online purchases), cash for physical purchases.
But knowing that 2 years ago I was completely in the Google ecosystem and also had more than 30 smart devices at home with 2 Google Nest Audio, it was quite a lot of work to give up everything and replace every service/workflow.
But I'm finally much more satisfied with what I've got now :)
Again, thanks a lot for your comment!