Honestly, cubes have stopped going obsolete in 2016. For instance, the og yuexiao and original valk are both on-par with a lot of modern flagships. The idea of there being a mainstream and flagship culture is unhealthy, honestly, since this kind of onlook has made a lot of legitimately decent cubes become overlooked because of a more hyped release.
The GTS2 has full corner cutting, phenomenal performance with magnets, doesn't pop, doesn't catch, and has a solid feel. I don't know what is so obsolete about it.