I think so. IIRC Classic Ironman is “the way the devs meant it to be played”, and that’s when you get the full impact of the game. Normal is just training wheels to get the hang of the basics, and the odd thing is, not only do you not get the best out of the gameplay, you don’t even get the full sense of immersion, either. The full sense of immersion, of feeling that you’re actually responding to an alien abduction, etc., only comes when your mind is concentrated wonderfully by the thought of imminent death, when every single move counts :)
It’s only with CI that you start really thinking tactically, and exploiting all the game has to offer tactically. e.g. awareness of 180 degree cover + LOS before any alien sighting or combat becomes big part of the gameplay, and getting yourself in a position where you can hit as-yet-unseen aliens, preferably with elevation advantage, without them hitting your guys at all (if possible), and without awaking potential other close groups (on a Very Difficult setting map, which of course you have to do to get those juicy Engineers :) ) becomes important.
Not saying it’s Tri-d chess or anything, but there’s a fair bit more to it than the “standard” tactic. Yes it’s the standard tactic, but it’s more like a core from which you will deviate from and vary 90% of the time in various ways, as you try to anticipate trouble rather than just cope with it when it comes.
I now think a good middle ground is to play Classic with only Autosave on (i.e. no manual saving) and tapping Quicksave before those moves you instinctively feel might be dodgy. That way, you get some of the similar effect Ironman has of game momentum and freeing you from thinking about saves, thereby heightening immersion, and also, if the shit hits the fan, you’re only ever going to be able to go back to before the moment when the shit was the shittiest, you’ll never be able to totally recover, so you’re still committed to the momentum of a single game to some extent.
But also, hitting F10 before a move you have an instinctive feeling will be dodgy (which it invariably is :) ) doesn’t take up much psychological space, but will train you to be aware of and avoid “those” moments, if at all possible.
(I’m saying “you” here, I mean “one” - you’re probably a better player than me and I’m teaching Gran to suck eggs, but these are just some thoughts in defence of the game’s tactical layer.)