I agree - not a good piece to "TP" in, but any good BLU is probably gonna be casting more than swinging sword. So, really BLU skill +5 can be better for DMG Dealing, debuffing if you are more BLU-mage than BLU-melee.
Any BLU swinging a sword for 80-90% of a battle needs to start over and lvl WAR or get some Refresh/HMP.
Believe it or not, not everyone uses Windower and does not have infinite item gear swaps.
What would you say to someone TPing with Sword/Axe/GA/GK, etc skill +5 in the ammo slot?
What about STR+2? Acc +1? Happens all the time.