I have played at least one game of each generation of pkm, most just borrow to end the main and post game, so it could be said not 100%. And let’s go have been one of the most boring games of all.
When you jump to the third generation and are introduced to abilities and double battles, the first and second one become pretty outdated. And I really pour my soul on pkm yellow and silver as a kid, so it is not that they are bad games…it’s just that from hoenn onwards you have so many great mechanics that you can’t simply play without.
Let’s go took that away…and even only let you play with the 151 original mons, plus some alolan and megas. Personally if someone want to experience the first gen on all its glory, I would recommend pkm FireRed or LeafGreen.
Also the champion on let’s go is just a poor man’s rival. There is no way he can achieve the level of complexity that Blue/Gary has.