Indeed. Call to Power 2 had that model, they called it Public Works and you had to accumulate PW units (derived from your production "hammers"), and then invest those PW in improvements. Worked very well and got rid of the micro related to workers. Also, CTP2 had a mixed combat model, 12UPT called an army where combined arms was rewarded (three lines of combat, infantry in front, cavalry in flanks, flanking was that the cavalry could attack anyone in front or sidewise and add to the infantry attack, second line short range (archers, MG, etc), third line arty, siege, etc... combat was simulated inside a little window that included terrain factors, you could not "move" the units inside the combat window but you could retreat your remaining force if things were going badly... Perfect combat model for a civ game. No SoD, no CoD, strategical depth and some tactical elements simulated within a manageable frame. The perfect solution, if you ask me. Why did lil' Jony refuse to learn from others? Who knows.