Except when my forces were almost all mechanised, I didn't get to do any blitzing? In fact, they just rolled over and died. Apparently just as well as infantry do.
This is how this game works: sneak attack the other guy by sinking yourself into massive debt, destroy two thirds of their force while the rest sit around and watch, force them to go into massive debt also to eke out a better loss, make peace, recover in two turns because you've done more damage to them than they have to you, attack one turn later before the ink is dry, going into massive debt again, repeat as nauseum. Once you've lost the first engagement (as in, the very first turn of the process), you've lost the entire game and the rest is you stretching it out. Should I have called gg and quit at turn 2? Is that working as directed?
Bear in mind this is why almost every game has a truce timer. It's all very well to say "fight on" decamper, but theres zero reason to if you've already lost. Stretching out a loss isn't fun in mechanical games for the loser, believe it or not. It's not like you're emotionally invested in the history of your country and your interested in the story either, because in this game your country is just a blob to beat other blobs with. Theres an actual winner and losers here, its a mechanical game. Which is fine, and fun, but if that's the case then you should be able to recover from losing. Working to scrape back a defeat you can recover from is fun - being dead man walking from turn 2 is not. Honestly if I was you might as well have told me.
In terms of actual mechanical considerations the real issue is that you can borrow three times your income on day one, and my recommendation would be "you can't borrow more than your income on the first turn of war" which might help with the "keep kicking a dude when he's down"/magical blitzkrieg issue. Or make borrowing twice your income in one turn have actual consequences to it, and major ones. Otherwise, you may as well call game the day you get invaded the first time.
I'm not saying I'm ragequitting yet, because a) I suspect I'll spite decamper more by not doing it given the optimal strategy this game is basically force your opponent to ragequit and b) even if i do decide its not so much ragequitting as it is calling gg because barring God knows what shenanigans its game for me (to use a league metaphor, you surrender at 20 because you know where this game is going) but the point that I'm trying to make is that there's a serious balance and mechanical issue here and I'm not just complaining about getting beat once.
EDIT: hell, even a PM going " you are being attacked, how do you want to respond?" would do a lot to alleviate this problem. An all or nothing gamble like Mexico just did should have consequences. The rest of the army shouldn't just stand there like dead fish.
I'm not the only person with this problem, I'm just ahead of the curve with the continuation of the cycle.