Quote from Cryosite;292934:
Why would something cheap like an llb, easily enchanted and upgraded and special upgraded not be useful for "normal situations and grinding" but a longbow would be when it can only be easily enchanted and upgraded?
Special upgrade stones, according to another thread here on the forums, drop from intermediate+ theatre missions. Doesn't seem like they'll be too hard to get your hands on. Compared to the difficulty of getting glorious/caliburn/spike or even delusional, I think an overgraded bow is not too hard to get.
Because S/R weapons are bound to you... if you do work on getting a Highlander/Wing Bow S/R-Type and also happen to have an ego, that's already 4x3 of your personal inventory gone. The upgrades can be expensive if you're unlucky, and inventory space limits you from the number of personalized items you can reasonably carry without service.
Not to mention, the only path for the LLB that can even compete with the Long Bow for critical will barely put it ahead for max damage until G14 and be much more expensive to repair, which defeats the purpose of a general usage/grinding bow.