Sensuki
Arcane
Okay, I've been over this a million times with the dense dunces of IE defense. When my only strategy is to click on the first guy I see and then just watch. No interaction, no input by me, just watching, the combat neither requires strategy nor tactics. See, click, watch is not a strategy. Its just fucking clicker hero with just one click instead of a whole bunch. Clicker hero at least requires constant input.
Only extremely stupid people could find challenge in any of the IE games. Period. I prove this every time I play. Look at you, you call me an idiot yet I can somehow mindlessly role through combat that to you is a grand challenge requiring tons of tactical maneuvering and employments, and masterful strategic thinking.
If I'm an idiot what does that make you? Forrest Gumpish at the best. Do you find movies challenging? I know I don't, because watching things requires no strategy or tactics, even by idiots like me.
I definitely would be interested in hearing about the tactics you employ and your strategy when it comes to winning watching a movie.
What difficulty are you playing on and are you rest spamming?
Against most trash mob encounters you are quite right that you can just select all attack the first target and the party with AI on will do the work for you, but that is kinda lazy and you'll take more damage than you would if you actually put a bit of effort in. This kind of attitude emanates that you are rest spamming. In BG1 - Most Mages casting Mirror Image and Horror which requires some strategical or tactical consideration to overcome unless you perfectly interrupt their spell casting with sheer luck. Most of the time, in order to perfectly interrupt their spell casting this requires some strategical play before the encounter begins, such as lining up an arrow shot and then initiating dialogue with that character if it is a non-hostile to begin with or using Stealth to get the first shot before dialogue is initiated. That also requires that you actually score a hit on them as it is not deterministic. 95% of the time in a Mage encounter in BG1, especially in the early game you can't just roll up and select all left click attack the Mage because he'll get Mirror Image up, cast Horror and then Magic Missile/Melf's Acid Arrow your PC to death - game over.
Compared to a Wizard in Pillars of Eternity, you can actually just ignore every spell they have, pretty much. You don't have to debuff them or remove any protections, you don't have to do anything to protect yourself from their attacks. You can just attack them and they will die.
I can think of heaps more examples, feel free to keep posting if you need some more enlightening.