To an extent, I can agree with that sentiment. However, it also doesn't address the question. I can compare 2 jobs and come to a conclusion that one is more complex than the other. Fine, what if someone else comes along and says, I don't agree. Who is right?
Therein lies the issue. That grey area in the middle that noone really knows what it means. This is why it is important to define such terms and, if they cannot be defined, then a better explanation should be added. I think Job A needs more complexity and in my opinion, they could do that by doing something along the lines of X. That way at least people have an understanding of what what someone means via an explanation. As you have done, by comparing 2 Jobs, you compare the before and after for the job and analyse it to see what potentially comes of it.
Definitely a difficult thing to pin down.
I think Summoner is missing an overarching mechanic (After typing everything I am adding this in. I want to say it is missing some sort of build up. That ramp up to the burst). Something that takes summoning the primals to do and helps to break up the monotony of pressing the same button. One thing I notice is that Demi Summons do not use the Gemshine button and the Lego summons do not use Enkindle. Starting with the Lego Summons, there is no reason you couldn't have it activate and on use, it summons Shiva/Levi/Ramuh for an attack. Could be an oGCD, could be a GCD, let's have fun with it. We can then say, by using Enkindle here, you build up another resource, call it Zantetsuken gauge. Then, once you have your Demis out, gemshine turns into Zantetsuken and you effectively have a combo, on the oGCD, that is weaved between the Demi attacks.
What people think of that idea, who knows. Just spit balling ideas.