I understand that, but that's not my point. ST can also be amplified by Bane, weapon attacks, consumables (spike bulbs, grease bottles), other spells, items (absolute gloves, ritual axe). How is it different from bliss spores or bless or staff of arcane blessing for attack rolls? Point was, that using a single target controlling ST spell, even if it had a straight +4 bonus, against a regular bandit is suboptimal.
The balance of all those is in favor of AC attacks by a huge margin. Half things that help ST are unreliable by themselfs because they need ST roll to hit not to mention most of them need concentration slot and a spell slot. In short it's really easy to get that 95% hit chance with AC attacks missing only on 1 rolls. Even the most hp buffed bosses melt in two surprise rounds as you can see in all sorts of solo videos on youtube.
i bet if we had EA numbers for bane casts and bless casts the bless would sweep the floor with bane so hard...
