Bars are relative
Every bar is scaled against the
strongest unit in the game for that stat, so a full Health bar means "nothing has more", not "this is a
lot". DPS is derived — damage × attack rate — rather than being a field anything is authored with.
Traits are the interesting part
Auras, growth chains,
debuffs on hit, structure damage bonuses and active abilities on their own cooldowns all live in the
traits list. That's where a unit stops being a number and starts being a problem.
Flying ignores your walls
A Tier 5 base digs a moat
that only flying monsters cross. Everything else has to come through a gate bridge — which is exactly
where you want your towers pointed.