Hm, indeed. Unfortunately, it is not quite easy to find "the" new RFC, there was quite a number of correcting and extending RFCs issued over the last (almost) 30 years, which is not that surprising...
Are we going to do something about it? Is it likely that relaxing/changing the rules on our side will break any possible workarounds that people might have employed to make the search work like they want it to work?