Attitude towards complete anti-magic!

All this is true, of course, but a druid can also use the Hive to neutralize an enemy mage, for example; cast Luck and Haste on their own units and forward go the bees, keep that nasty mage busy

Sounds not bad. Using the Hive is a tactically sound move, but unfortunately, it only distracts for one turn. Anti-magic provides a full guarantee. It's cast once and, as they say, forever. Its goal is to protect the most valuable unit (that's a matter of preference). General Luck and Haste are GOOD, but it's important for me to save the phoenixes (for example) from all sorts of Disintegrates, Hands of Death, Hypnosis or (oh my god!) berserkers. Because if they are taken out, no amount of luck or haste will help.

Then that's another downside to anti-magic

ZYbr, why a downside? Some will rise. And some are always resurrected.