Did you bother to contact their customer support asking if they plan to add this feature?
In my biased opinion, I would imagine Gmail would want to use you and your emails for every ounce of data they can squeeze out of it. However proton is a paid service who doesn’t sell your data, with much less Human Resources than google, therefore less language support. They add things as fast as they can get around to them. If you inquire they might be more apt to add the support if they have someone on staff that can do it.
I saw the video this morning before work. I’m in the same boat as you. Bought a MK4s about 2 months ago. Very happy with it, but I want that CORE One.
The product page says it won’t ship until Jan ‘25, so I’m just gonna be patient and wait for stock to arrive at PrintedSolid in the US. Hopefully they’ll have some by summer. If I still want it that badly I’ll get it. Maybe the urge will pass and I’ll be content with my MK4s.