You've just proved my point. Supcom is tactically shallow and is increasingly flawed the higher you go in the tech tree.
Supcom was never designed to be a tactical game, it is designed to be a strategic game. I wouldn't say it is increasingly flawed as you go up the tech tree, as two equal opponents will generally counter each other until one finally makes the breakthrough.
The problem is usually that meeting someone of equal skill level in the game is quite rare, so most games are around one player being able to snowball economy more than the other.
I haven't played Sins at all yet, however, it looks like it is even more economically based than Supcom. I can't wait to get into the Beta, however, from initial impressions of reading the forums and seeing the screenies, macro management plays a far larger role than micro. Your vision of tactical battles will likely be unfulfilled, as it will be similar to supcom. Meaning that, if you spend your time microing 15 units so they beat the odds against 30 units, you will still likely lose as the guy spending his time microing his economy, will outmatch you. His time is better spent.
I agree that the ideal world of sneak attacks and heroic wins against all odds are what we dream of. However, the reality is that the player who can simply put out the most units through economic superiority will win the battle.
Super Weapons just make that quicker.