The moderators are quite quick and often rigorous when it comes to real spam (advertisements) or just mindless post spamming and will delete when necessary.
There are not that many people who dislike the requirement (according to the weak contribution in this thread), thus the rule is still in place and hasn't been changed.
If suddenly 500 or more users would complain about this, thus this or a similar thread would grow to 13 pages (or more depending on your settings), the powers that be would certainly look onto it with another point of view I assume, and depending on the arguments, the rules might change (they often did in the time I have been here), but if members just complain with sarcasm and not arguments, it will probably just stay the same.