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There are still plenty of ranged units that don’t suffer penalties in melee combat ;)
In general, it’s easier to build monks...:), but archmages aren’t that difficult to build, especially if you’ve already built their unupgraded versions...:)
Archmages require a library, which consumes a lot of resources. This always slows down the process.
You can also specify ranged units that don’t suffer penalties in melee combat (excluding Titans).