I did not meant to go "against" your arguments but to offer another point of view.

About rDPS
I agree, rDPS outcome will depend on the DNC/BRD and on the rest of the team.
However, it's not a DNC/BRD problem but a team problem. They can play perfectly, they did their part.
You could argue the reverse situation, if a MCH is playing perfectly but the Ninja misses its Trick Attack, DNC misses its buffs and SCH forgot to push Strategem, the team DPS will suffer greatly.

Yes the MCH will do a nice colored number on a certain website, but the team performance will suffer.
And this is a teamgame, we play together to bring out the DPS, not the team playing against each other for colored numbers.

MCH could not care and summon the Queen at random, it will bring the same rDPS but the overrall team DPS will suffer.

About phys range, MCH problems
That is exactly the problem.
MCH doesn't works as a "pure DPS" because it's also a phys range.
Pure DPS have high personnal damage but low utility, phys range have low damage but good utility.
MCH just has all downsides with no upsides.

And as you pointed out, MCH doesn't even have self utility like manaward and third eye.
And we cannot count Tacticians as all ranged have Tacticians. I wished the trait reducing the cooldown to 90s would also have something else to bring differences between the all 3 tacticians.

Again about utility
It's again about "What does this job bring to the group?"
You got a BLM? Well you don't have SMN healing/res or Magick Barrier.
You got a RDM? Well it doesn't have the BLM damage but it has the valuable Magick Barrier.
You got a RPR? Well you have low damage but the valuable Arcane crest.

You have a MCH? Well you have a bad news and your team needs to work more for the party survival.

We have more than one solution.
I completely agree, if they slapped 2 new defensive on MCH, that would fix the problem until 7.0.
Also reduce the fall off from Chain saw, because in practice that's the only AoE MCH has for the whole DRS.

If MCH DPS was pumped up enough, I know for sure it would also give MCH a value for the job to stand for.

Now of course, there are the mechanical issues:
-Hypercharge still not on charges (I'm confused as to why it's not yet the case)
-Everything about the Automaton Queen, the list of problem it suffers from is massive.
-Everything about Wildfire.
-Everything about Flamethrower.

The balancing issues:
-Pure DPS but only against a single target. Pure crap in multi target.
-AoE on target except for Chain saw with a massive fall off and BB barely worth.

Those are problems but they're not critical right now. Except the Queen, that's a critical mess that needs to be reworked by 7.0.
As of now, MCH needs a value to compete with DNC/BRD. It can be raw DPS, it can be utility, since the game is limited to those two values.