Let's Go Pikachu/Eevee are simply late gen 7 remakes everyone expected would be Diamond/Pearl - and that's a good thing

[HyrulianScrolls]

Lonely_Dolphin said:
There is no testing outside of R&D, the games they make are the games they make. No one will accept that excuse if the games are bad, so they damn better be good!

They could certainly use these games as a way to test how the fanbase reacts to certain features for Gen 8. Like the Go implementation for example. A Link Between Worlds was testing ground for BOTW if you don't understand what I mean.