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Tera isn't as big a problem as Dynamax was letting you set up for free with gorillion HP and giga moves, its problem is that it enables a free resist to setup on what should be a counter/check, and those boosts alongside a defensive typing that won't fold to priority is usually enough to snowball into winning the game, Dragon/Quiver Dance/Belly Drum
If previews on each tera are allowed you can plan for a reasonable read but still get outplayed if they decide to stay the original type or to tera when they think you think they won't, which means setup mons get their general nerf but other tera types like ones that buff their own stab or use a defensive tera to not sweep can still function
