I play Pokemon Go and have linked my game to Pokemon Go for some Pokemon transfers. To do this you have to play a while into the game, and even then I largely encounter every Pokemon in Let's Go without too much hassle. So the biggest draw seems to be that you could transfer large amounts of Pokemon into Let's Go parks where you can play mini-games where you have I believe 15 or so of the same Pokemon.
To answer your question, yes just grab this game. The integrations with Pokemon Go are so insignificant that they are largely forgettable. If you enjoyed Pokemon Yellow or are into Pokemon in any way, this game is well worth playing.