Bunkers are still the best 1v1 specs right now and soulbeast can't do anything to stop them, if you run full glass then you are toast as soon as they evade your burst, the balanced build is better. Like really bring the oh-so broken soulbeast against a mirage, chrono, berserker, protection holo or boonbeast, or a good hybrid guardian, no chance.
Many specs are way better than soulbeast for 1v1, but it sounds like this is not about balance in fights but the fact that soulbeast may have a chance of dismounting someone, unlike those even more broken builds, so poeple come complain about soulbeast and not those others as they just walk past those.
Sicc Em isn't even a mandatory inclusion as boonbeast doesn't even use it which shows it isn't undeniably OP, which is a way better build than regular soulbeast, but no one complains about that build, or these other duelist builds which are better than soulbeast for 1v1s, why? They don't shoot you off your mount, even though being a better duelist by miles.
The only poeple that die to the glassbeast, which isn't a good build even(the balanced build with some survivability is a better duelist), are bad squishies that just try to run instead of fight. Heck, berserker arc divider burst still hits for twice as much as a rapid fire yet no one complains about that anymore after the nerf, because it doesn't shoot you off your mount.