I'm using a 1920 x1080-Pixel monitor. Nothing special hires nowadays.
I'm pretty sure the forum-software can detect the screen-resolution of the user and then render the shown website depending on the screen-resolution and browser-window-size
There has been lots of discussion in many threads on this.
Sometimes it even gets heated.
I don't see anything changing.
You will see the apologists come up with all kinds of excuses/reasons for it, but IMO, it is mostly due to the younger crowd that is now creating these platforms.
They are using their smart phones and tablets for access and hence put little to no value on the more traditional desktop environments with bigger screens and alternate input devices because they are simply not using them or not using them very much for sites like this.
This kind of thing is not unique to this site, it is happening all over on web sites.
Me personal surely not.
If we want to continue schrinking down peoples intelectual abilities down to sheer dumbness so that it will be enough for Donald Dumb shouting "wooooo!" at the sheeps to make them all run frightened into the direction he wants them to run. go ahead
No IMHO the arduino-forum should offer the opposite in combination with flexibility.
Old programmer-wisdom: a code is never finished. Just executable (most of the time) You can always improve or extend the functionality
I meant "optimal" from the marketing/e-commerce point of view of the researchers that do the line-length research.
I would imagine that excellent (from the user's perspective) reference material would minimize reading time, engagement, repeated visits, and click-throughs, (almost the diametrically opposite goal of marketing) if it clearly, memorably, and fully explained the subject.