Only time i see GIF playback speeds being odd is during the first load of the animation. Can't say i've seen any gifs be odd outside of first load here tho?

Luxembourgish implies its not necessarily in Luxembourg, but rather a region for which the language is used in. Which yes, is primarily Luxembourg but does include some other parts.

This type of tweak can actually be easily done using a custom user style for the site.

.calendar-week:has(> .calendar-day.disabled:nth-child(7)) {
display: none;
}

YT comes to mind for this, when scheduling videos out for future dates. Left is current, right is my idea behind this.

That's absolutely stupid. I don't look at that number for any reason other than out of curiosity or as a general gauge of games that are strictly multiplayer that requires other players to have an idea of relative activity.

Do people use those metrics for non-live games seriously?

Never live when im around :(