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There isn't much difference between fantasy and sci-fi; I like both, but I'm not conservative, and I would like to see a proper implementation of their combination.

What's not a proper combination in Might and Magic? :)

Added after 1 hour 25 minutes
On the topic:
It is quite possible that, after producing many copies of blasters, Archibald's advisors decided to conduct an experiment and created something like a weapon factory using the Sky Forge. That is, the technology of the Ancients is somewhere at the seventh level, and the blasters from Might and Magic are already available to creatures of this level, and the rest (including goblin weapons, flamethrowers, etc.) were produced in the Forge. This assumption can be a plot-based explanation for why the Forge is balanced not only by cost and growth rate. You can compare creatures in terms of strength with others. For example:
a zombie with a circular saw against a swordsman or a demon
a goblin's laser weapon against a mage's staff beam
a minotaur's jetpack against teleportation or flight
a flamethrower against a magog, a fire elemental, or an ifrit
a rocket or a naga on a tank against a massive magical attack or the breath of a powerful dragon
Thus, in terms of balance and even legend, creatures of almost all levels in the Forge can be stronger than others, but not drastically. In balance, this can be represented by the fact that they will be stronger than creatures of their levels in other cities to some extent, but not drastically; this will also be compensated for by a lower growth rate and a high cost. The exception is the seventh-level creatures and, perhaps, the sixth-level creatures, which are armed directly with weapons from the Sky Forge. They should be the strongest units in the game, but with a huge cost and a small growth rate.

Added after 40 minutes
It is also quite possible that the above theory is incorrect, and the factory built with the help of the Sky Forge produced some of the Ancients' weapons and weapons approximately similar in strength to them. Then, in terms of balance and plot, all units should be much stronger than the units of other cities, but they have a very small growth rate and a huge cost, and some units below the seventh level can be recruited not only for gold. The seventh level will then be a completely exclusive unit.

Both options are possible.