I came, ( ͡° ͜ʖ ͡°), for the TiTS, but I stayed for the interesting game mechanics and characters. (No seriously. I can promise you I've never been this active at any other forum I've been a part of, even other adult games forums)
It may be a sex game, but it still has "game" in it. Just because its main focus is smut, doesn't mean that there won't be any focus on writing tough and exciting combat encounters.
The game is still a WIP so we may still see battles where such synergies and weapon swaps are either valid or necessary strategies. Or we might not...only time can tell.
Well what makes TiTS a game is not it's combat system. Sure I love to kill things (well not actual things, just virtual things that drop XP and some gold to kill more virtual things).
However it's just not enough. To make killing things entertaining, the player has to have an incentive to do that. From where I come we says victory without risk brings triumph without glory (approximate translation). As a player we want to win, we want a "good end". Give the good end for free and, magically, noone wants it anymore. It loses all interest. That's because we also want to feel that we deserved it. That's what combat are for. It's a very primal and simple "obstacle" so victory can actually tastes like victory at the end. XP and gold systems serve a similar purpose "game is hard, work hard, game becomes easy".
The thing is, in a story driven linear game, you can put other type of obstacles. A recent example is Life is strange. No spoil but if you played this game until the end, you know what I mean.
TiTS is for sure story-driven, and I'm definitely not talking about the probes and the "become CEO of steeltech" shit (that literally fits on a sheet of toilet paper). I'm talking about it's characters. All of them has a story, and if you play more than the 10 minutes required to finish the main story line, it is because you want to complete those interesting individual side stories. it's a story-driven open world game in a way.
So why can we beat things to submission in TiTS? for the same reason than there is a card game included in The Witcher 3. Because it slows down the progression, it's fun and as a bonus, in TiTS we get to have sex with the thing as a reward!
What I mean with that is: making a game difficult? Sure it gives purpose to the game. Having combats in it? Sure, it's refreshing to do other things, talking with Sera days long would be depressing. But for me focusing on combats would be a complete miss. TiTS is not Diablo nor Dark Souls. If something has to be tough and exiting (and as I said, something HAS to be tough and exiting), it must be the choices between story branches and earning the trust of the different characters. An "hard" TiTS game is not a game where every single zil bring you down and then rape you. It's a game where you can make Anno cry.
Note: I spent an hour trying to explain why I think this game is a game. Concerning psionic abilities, people want that, but it has nothing (or very little) to do with combat. It has to do with character building, and character building is what make TiTS a GREAT story-driven RPG open-world-y game. it makes it so the "R" in this game is whoever you want.