Hi m8
Lexus most certainly DO recognise this trait/fault.
I had a 200se for about 3 years (sold it last year - but still drop in on here now and again)
Firstly let me say that I loved the car, BUT, when I paid the thick end of 20k the last thing I expected was a clunky gearchange! It is easy to over exaggerate the problem, as it becomes a bit like chinese water torture. Every time you change up from 1st to 2nd its there. Not a CRUNCH, but an annoying little bit of resistance, and a unnerving metal on metal "noise".
Mine had the "notchy" 1st to 2nd. I complained several times. The first time I complained I got a "technicians report" stating that the gearbox was fine. Eventually they agreed to change the gearbox oil for a "stiffer"one. This did improve things slightly, but still not to my satisfaction. Eventually I spoke to a really switched on mechanic at another dealership, and he showed me a copy of a document which he told me all Lexus dealers had been issued with. There were a large group of chassis numbers between "xxxxxx" and "yyyyyy" that Lexus would do something about IF the customer pestered them for long enough (or words to that effect). The course of action was 1) put stiffer gear oil in 2) strip and replace gearbox bits as necessary.(wouldnt replace gearbox - too costly)
In fairness, option 2 was offered to me, but I really didnt want the hassle of having the gearbox on a nearly new motor being fiddled about with. Especially as the mechanic said he could offer me no guarantee that the notchiness would disappear even after a strip and rebuild. What also put me off was the fact that he said his team had never done this in an IS200 !
Having said all that, I noticed the notchiness on EVERY IS200 I ever drove. Including the ones supposedly out of the chassis range that the dealer showed me.
Also, it NEVER got any worse over all the time I had it.
But, don't be fobbed off !
Regards
Lofty