I suppose you wanted to say “simplify it or flesh it out a lot more”.
First, I don’t agree that it was the weakest* part of the game. It had management of:
base construction (where, when, how many, what type, what expansion of module, internal organization of them)
hiring troops, personnel
research, manufacture
selling/buying stuff, transfer between bases
ufo interception, launching missions
All having to take care of the budget (income vs expenses) and the nations priority that affects base locations and missions priority (look out what nations have which status, which gives more money, etc)
In other words, while it wasn’t the heart of the game, it was a substantial metagame that gave a good context to the campaign and the missions themselves. At least, to me, it gave me the illusion of being in charge of stopping the alien invasion, in a way that I wouldn’t have if I wouldn’t have control of building bases all over the globe, hiring personnel, manufacturing new ships, researching new weapons, etc.
And second, I could only agree with your sentiment of “simplify it” if in exchange they would raise the complexity/detail of the tactical missions, but it isn’t the case here. They simplified both the geoscape and the tactical battles.
I’m not sure how you can be glad that they changed it (by simplyfing it), if by your words it seems you didn’t think it was meaty enough in first place.
edit
*well, technically you are right, it was the weakest part, but that’s because the game have only two parts, if one part it’s 65% of the game and the other is the 35%, the latter one will be the “weak” part. Not that part was bad or undercooked.