You saw why it can be an issue yesterday in our party. Difference being we had 2 Ridills, but the damage done by each ridill swing was significant. Look at the percentage of damage for phraust and I for weaponskills vs. tp. My guess is its my usual 2/3's of damage done via tp and 1/3 from weaponskills.
Joyeuse does not do significant damage while tp'ing, so it is needless tp given to the mob. Also, while the mob doesn't use tp moves right at 100% for the entire fight, it does do it when the mob's hp is lower. You saw the damage that can be done by Firespit with BLM mobs...2 x's 841dmg = dead Jamal. I'd rather not take that chance.