for you is normal to ask more than other jobs for the ninja, but at the same time we must keep the dps in check.
just for the weapon skill (not the one OGCD) we get 7 input needed, for the mudra you add 4 more input. that lead you to a minimum of 11 button of your keyboard that must be configured for be used correctly. other point the trouble of the mudra is the fact that in 2 second, generally, we need to do the 4 input. the system is not friendly remember? any mistake will be punish badly, leading you to loose your ninjutsu.

for the weaponskill is not a trouble, the animation are long and you have time before your next action, then you have time to move, there, you will need to move and do the 4 input in 2 second at best. yeah, people will be able to do it, but do the system will be used correctly? do the system is smooth with something like this?

it's no to both. instead to develop the ninjutsu and add a new mechanic, they did decide to forget this point and go with positional. i'm tired to see people come here say it will be doable then we can't complain. the point it's the level of skill needed for make this a system viable. no, it's more, the skill needed for make this viable for high level content.

you talk about a bit of loose of dps, when in high level content it can often lead to a wipe. do the static will be accomodate and accept ninja player, when they will not always have the skill needed for use this system?
the answer is no! they will not!!

soo far people are pointing the fact that positional is doable, but will recquire a level skill extremely high for be able to use this system as intended. since mudra are not a friendly system, the lag affect it, any error affect it... how many people will simply scrap ninjutsu because they need to get in position and it will recquire too much?

because the ninja use 2 different mechanic, you do have the combo systeme from weaponskill on one side, using a mix of skill with 2-2.5 gcd and out GCD skill.
and on other hand you do have the ninjutsu, that use the mudra systeme, asking to enter combinaison, in order, in short time for get a skill from it. this two system collide already, often you must choose what you will need to do. but now they want to add positional into this. it's crazy... it was recquiring a lot of skill and training for be able to use this correctly. but now this will be far more... i doubt most of the player will have the skill or the will to face this sort of tedious system!