I've had bad luck with bow cavalry also. I put them on skirmish--thinking they'll be OK---then the next thing I know is that they get backed into a tight and get wiped out--when my attention is elsewhere, . Consequently, I simply stopped recruiting them.
However, I just finished a short Takeda campaign and at some point got stuck with a free unit of bow cavalry for completing one of the Bushido arts. They just happened to be in a lower level coastal castle when it got attacked, which meant I had no way to use them outside the fort. The only choice was to dismount them for use as rather weak foot archers. I didn't put them on the wall, but lined them up against the side of the center building. I completely forgot about them until the battle ended.
I was out numbered about 2 to 1, but that's usually manageable--when defending a castle. When it was over--was I surprised to see all 60 of them survived and was even more astounded when I saw that they scored just over 90 kills. I don't know if their kills were from lobbing arrows over the wall or from shooting attackers that made it briefly inside the fort, but it was still the best I have ever done with them.
Cheers
P.S. I also don't bother with the bomb throwers either--for pretty much the same reasons.
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