SpaceInvader

I'm using FreeBSD on my servers non stop for 20 years. It has some quirks, but it's rock solid.

He was the first I know of that did such thing.

You don't get telnetd enabled by default. To get it working you need to explicitly start it. No idea why you're talking about it here.

Binary upgrades on FreeBSD are fine. I rarely compile my own kernel these days, but even when I did needed a custom kernel I never had any issues. It just works, For me FreeBSD and OpenBSD needs much less maintenance than Linux.

Actually perspective WILL BE different, angle of view is changing, not what the lens is rendering.

I'll try :) Generally speaking focal length is a characteristics of a lens which does not change, if you use smaller sensor you're just "cropping" what given focal length would render. For example if you'd have, let's say 100mpix camera and 24mm lens it would give you different perspective than 85mm evn if you would crop 24mm image to have same angle of view as 85mm.