That's why I said "or something". Didn't say it was perfect, I just think HBR should be good for more than just building better units, like Math (or is it engineering?) gives +1 road movement point. Let HBR with horse resources do it too.
Lighten up.
What should we add to Iron Working? And what should be added to Rifling? And what should be added to Gunpowder? And Archery?
And with that line of thinking, shouldn't all techs have a military side as well? Personally I would like all promotions to have a tech prerequisite. CG requires masonry, Formation requires Mathematics. Etc Etc Etc. This would encourage players to obtain techs they would otherwise ignore.