Why not? RE272 has a much better dynamic range than RE0 and RE252 and is much faster, clearer and detailed than RE1. In fact, the more I listen to RE272 the more I start to feel that it takes the sound of universal IEMs to a whole new level. I hear more detail than I did with FX700 and SM3, the sound is very coherent and balanced - more so than FX700 or SM3. Clarity is the best I've ever heard. Dynamics are better than on SM3 and post other BAs. Soundstage is really good - I find it even more spacious than that of FX700 with better depth. Bass is deeper than SM3 and about matches FX700 IMO. Timbre is at least as good as with FX700, but I think it's even better than on FX700, especially in the low frequencies, where FX700 sounds a bit muddy and sloppy vs. RE272.
RE262 is also very good. Not as detailed or super clear as RE272, but close enough with similar dynamics and soundstage. Both are quite a step up from RE0 and RE252 in richness and sense of space.
Well, I find RE252 clinical compared to RE0, RE262 and RE272. Although I don't really like the coloration of RE262 much either. I really like the coloration of RE0 though, which sounds warm and pleasant to me especially with stuff like smooth jazz. RE272 is the one that is truly neutral IMO. It sounds a lot more realistic than RE252 as well as the other Hifiman IEMs.