The Neon/Iso buffs, Viper nerf, and Skye nerf are the only substantive agent changes that have happened since Gekko 's release a year and a half ago. The valorant meta doesn't even change from season to season as much as other competitive shooters do.
Changing metas are a trait of the genre and something pros should expect when they play the game. Aside from the neon/iso buffs actually, it's all been extremely predictable too. Of course Chamber TPs will be nerfed. Of course recharging recon flashes will be nerfed. Of course Viper's ability to lock down sites better than literal sentinel agents will be nerfed. Pros shouldn't be surprised by this.
And it's not GenG's "homeground." It's the same map for both teams, and the better team wins. If Heretics has a problem with that, they shouldn't have dropped a series, or they should've been more competitive on more maps.