I honestly don't know what you guys are talking about, but HO and stall are not the only viable playstyles lol. In fact, I see less HO than just standard offense that usually ends up being just straight bulky offense, and balance is still great. I mean, just look at a lot of the recent SPL matches. So far only two players have used stall, and all of the other matches have been a mixed of BO, balance, and offense. ABR vs Lysergic in round 1, both were using bulkier teams with ABR utilizing good balance Pokemon such as Skarmory, Fini, and Coil Zygarge, while Lysergic ran more of an offensive build but still on the bulkier side with Heatran and Zapdos. Aim vs Anti in round 2, both teams using a very similar bulky core with Tangrowth, Heatran, and Lando-T. There have also been lots of Amoonguss and Ferrothorn too. I'd say the only notable match in SPL where HO was utilized was in Axel's match where he brought that Scolipede HO team, and Zamrock's match with the Sticky Web PZ team.
Like, I'm just not seeing it. Do you guys know what HO even consists of usually? If not, take a look at Xtrashine's HO in ORAS that was fucking everywhere during Smogon ladder tour, where it's basically a lead with multiple win cons to heavily pressure teams so another win con can usually clean up. You're not really seeing that in SPL at all right now, nor even on the ladder, but when is the ladder not a stall fest? It was the same shit last gen. OU has plenty of Pokemon that fit solidly on bulkier teams, such as Celesteela, Ferrothorn, Heatran, Tapu Fini, Amoonguss, Magearna, Buzzwole, Lando-T, etc. Yeah sure the meta may be a bit more offensive in nature compared to the end of ORAS, but that's kind of what happens when they introduce a ton of new offensive threats. Despite that, the meta is far from being a stall HO fest, in fact I think it honestly promotes use of a variety of different kinds of builds. Sure we have plenty of good balance breakers, but we also have ways to combat that as well.