thisthese days most of my builds, retro and non-retro all have various ergonomic lock-on grips as I prefer the easy removal - and comfort.
I'm with you. I have been running ESI grips on all my modern bikes for a few years now. Before that ODI Attacks were my go to grips but ESI are as you quite rightly say the most comfortable ever. They also wouldn't look too out of place on old bikes either.I'm a recent convert to ESI silicone grips. Most comfortable grips I've every used. Previously I'd used ODI Attack and Ritchey foam. Onza Porc and Yeti BITD.