Well, to clarify further:
If you are good at the action scenes, which I think most folks who are good reflex-based games can easily attain, you have an unfair advantage. You can take a crappy unit (David) and routinely destroy big targets (Goliath).
This throws off the challenge of a "typical" strategy game, in that your units are "better" at fighting than the enemy units. Again, the reason is because the player has skill.
I guess not everyone will be good at the action scenes, which is when the difficulty swings the other way...
Luckily, an "auto-battle" option can help folks who (a) suck at action scenes or (b) are bored with action scenes.
GENERAL DISCLAIMER FOR ANYONE READING THIS: I actually really like Vasteel, it is a good game, especially when it came out. Years later, it still holds its own, but, of course, the breadth of strategy games available now is so vast and varied. Vasteel is up against a lot of competition now that wasn't readily available (or simply didn't exist) back in the day. SO, BASICALLY, YOU SHOULD DEFINITELY TRY VASTEEL IF IT SEEMS EVEN SLIGHTLY INTERESTING TO YOU.
http://archives.tg-16.com/turbo_force_0002.htm#working_designs_read_the_fine_printA long, long time ago I said that Vasteel was an modern update on Archon...a game I loved playing on Apple ][
PLUS: Red Book Space Jazz ++AND++ PSG chip tune soundtracks provide great music to listen to whilst playing.