As an MM main, this is an odd read. It is an opinion piece and I think you are fairly upfront about that. As far as a guide, I would say it is a guide for folks with the OP's exact tastes and quirks.
I think it does point out some frustrations people can have while new, but I don't think it then puts those people on a good path to layer game (not just endgame).
One quick example is the "pshhh, why even bother with def/res or healing when you die fast anyway and just can resummon dead pets fast."
Let's say I have a little focus on def/res, not huge, but not ignored. 1/3 of enemy attacks miss from defense and the ones that land do 1/2 damage. Now I am taking 1/3 of their total damage. If I heal, me or my pet, for 100, the enemy has to do 300 to undo that.
For an MM you can go farther and, while in bodyguard mode, your pets take some of that reduced damage for you. If you have 3 T1 and a T2, you split that damage into 6 and they take 1/6 of it each and you take 2/6 of it.
I take a 100damage hit, it drops to 30ish, then that is split and I take 12 while the minions each take 6.
If I can heal 120 then it would take 1000 damage to just undo the healing. If it is an AoE heal, then my 120, in this example, just became 600 of "my HP" healed.
On to the second part, resummoning.
While a pet is dead it is not tanking for you, and it is not attacking or using utility powers. It is like another AT just losing access to 2-5 powers for a bit...so you resummon.
During resummon they come in as base pets with no/fan buffs up. Assuming they don't die, or you summon them in a safe spot behind you, then you do a quick upgrade or two, then get any clicky buffs up on them. If the unsupported other minions survived then you are back up to snuff and can get back to work.
That whole time, my team and me(MM attacks have utility and do damage) has been getting heals and applying constant full damage to a debuffed enemy. The inspirations I fed them and the huge Victory Rush (leadership pool buff) are still active for our next group because they didn't die and lose the buffs.
...For ONE example, heh.
Now, that said, you CAN Summon, Upgrade, Buff, Rush into combat, Probably win the attrition fight against the group you aggro'd, fall back, repeat. CoH is NOT a hard game and that playstyle will carry you through the whole game. Teams won't like you in high level content, but that is another matter for later and outside the "guide for newbie" scope.
As a "guide to get you through some early pitfalls" I think this works and is easier for a new player to understand and relate to, but for later and advanced stuff (if that is their intention) they will need to unlearn a bunch of this.
Lastly, as you seem to be more story interested, you can disable XP gain in the options, so you can fully run entire areas without out leveling them.