It’s important in science (but also in general) to verify things that are thought to be obvious or “common sense”, since not everything that the broad public agrees on is true after all.

To be fair™ they did at least do a little bit to deal with the existing answers becoming obsolete by changing the default answer sorting. The “new” (it’s already been at least a year IIRC) sorting pushes down older answers and allows newer answers to rise to the top with fewer votes. That still doesn’t fix the issue that the accepted answer likely won’t change as new ways of doing things become standard, but at least it’s a step in the right direction.

Yes they’re usually called “<fontfamily> Display”. IIRC Display variants are optimized to be used on digital displays (usually on the web), where a lower resolution (72ish DPI) than printing (~300 DPI) is quite common.