it's cool to disagree with details. but it's best to be detailed as you do it, otherwise it risks sounding wooly. not least because, fwiw, i largely agree with what you say (up to the point where you cite seysses on terroir, anyway).
in that vein -- the bonnefond/roumier ruchottes barely resembles gevrey in most vintages. young or old. compare it to rousseau, or mugneret, and all becomes clear. in my experience, old mugnerets have tended to be the best wines i've had from the vineyard. but georges had a very definite style, as does rousseau. taste enough of them, and you begin to get an idea of what is in the vineyard versus the cellar. (this echoes a point .sahsa makes above -- you have to learn the discriminations. it takes time, and a certain amount of dedication to the repetition of themes. which isn't for everyone, yixin; i am a notoriously monomaniacal drinker.)
what i liked about esmonin was that his ruchottes, though usually "not as a good a wine" as, say, mugneret, expressed the common elements you see in a range of wines from some gc gevrey vineyards extremely well. which is also to say, i guess, that to really understand what i like about f esmonin, you have to really know a lot of other wines well too. and it's here that the problem with everyone fixing on a single model of what makes for "the best" wines kicks in: it can all start to get very russ meyer very fast. sometimes one might want the nuance of the vineyard in a slimmed down package, and f esmonin offered that package. i liked exactly what other people missed. and i knew i could get what they were missing elsewhere. the converse is no longer true. i hope this conveys some sense of just why i regret the "improvements" chez f esmonin.
or, to put it another way, and take a polarizing example, consider roty. the house style there is so distinct that unless you know the terroir, you will probably miss it. but if you know the terroirs, then through the style, roty's wines are very expressive of them. jayer was similar (although i care less for the terroir in vosne than i do in gevrey). this is the reason why i buy and drink shit-loads of roty (and jayer), and i'd argue it is what it is about both roty and jayer that explains why they often made wines that are great -- but if you base your ideas of terroir on either, you are totally and utterly missing the point (albeit that you will end up on the same page as seysses).
fb.
ps. i agree about the 00 and 01 esmonin estournelles, btw. it was a reliably interesting wine under the old regime. these are the last expressions of that old style, and i like them a lot (a lot of very terroirful 00s were made in gevrey, which is not what the bluffers will tell you).