You think it isn't? OK, quote me the ICAO codes for TLS and MPL without looking them up (no cheating).
You think IATA codes are more mnemonic - sorry, I've no idea what the ICAO codes are, or even which airports they are. But I knew where EGJJ was - and if you tell me where TLS and MPL are, I cam probably tell you the ICAO codes.
It's horses for couses - if I don't know/work with the particular code system that someone uses (and I care enough to want to know where it is), I'll look it up, Google it, ask someone, whatever. But I don't expect everyone to bend over backwards and just so I understand something immediately when it's not my everyday bread and butter! And I don't - normally - care enough to respond to bleatings. No-one who works in aviation knows it all - we all have to look something up from time-to-time - by why make a fuss about it!
OK, rant over........don't really know why it riled me in the first place......