I have been self-hosting for about 25 years.
I remember the protection.outlook.com issue.
Once there was an issue with a bank that tried to do encryption, but used an expired certificate. But once I told them what the problem was, and that it was a problem for paying customers, they actually fixed it.
Being able to check the server log can be very useful. E.g. to tell someone that their mail was delivered to a served using their domain name, with that IP-address at that time.
But smartphone cameras are not progress on all fronts.
They are small and seem to be optimized to take pictures that look impressive.
I sometimes have a slideshow with family pictures running on a large monitor.
Sometimes I stop and look at a picture that somehow just look much nicer that the rest when you spend some time looking at it. If I then check the metadata, it almost always turns out to be one of few pictures I took with my old DSLR camera or a newer compact camera.
Of course those cameras are much bigger and has bigger lenses and should be able to make better pictures. But the best camera is the one you brought with you. Which is why so few of the pictures are made with a smartphone.
But it seems to me that all the computational power of smartphones does not quite compensate for the smaller optics. Or that they are trying too hard to make the pictures look spectacular.
Being able to check the server log can be very useful. E.g. to tell someone that their mail was delivered to a served using their domain name, with that IP-address at that time.