Iron Skin and Roar both benefit from the same Ability Strength mods, so it's not like you have to choose one or the other. Even with conservative mods, Rhino's Roar should still more than double the damage output of the entire team's weapons and abilities. If that's just not your preferred playstyle then fine, you gotta do you. But objectively speaking, you are selfish and inefficient.
The only viable excuse I can see for playing Rhino and not keeping Roar up fulltime is mana. But it is extremely rare for me to see an endgame team that doesn't have at least one manafeed, much less an effective team.
You still gotta throw on some range to make Roar effective as a team buff. Goodness knows randoms have a hard time staying in affinity range, let alone the sort of Roar range you get if you don't slap on a bit extra. The only time I really feel comfortable without is when I'm running with a cell of people I trust to stick close when I need to refresh.
Such aggressivity and pettiness is uncharacteristic of bay12. Please doubt my experience as much as you want, even tho I layed down the rationale and gave you a screenshot of my magnifiscent achievement poster, but understand that if you can lie to other, lying to yourself only ampers your own progression. Sure, if you know better, that's good for you. Do better, you have all my support.
Pointing out mistakes in your reasoning isn't aggressive or petty.
I mean I know it is possible to play a Rhino with heavy focus on skill, you just don't factor in the opportunity cost. Yeah you can put a ton of mods to make roar a viable skill, at the cost of another mod, more useful, that doesn't cost you 75 energy every time you want to hit something. Yeah, you can spam roar/stomp every ten seconds, if you're paired with a Nekros or have a team of players who use energy regen aura, at the cost of being paired with more useful frames in endgame.
Using more than one ability on your frame isn't a "heavy focus on skill", it's "knowing how the frame works". Roar scales off of AbStr, which I would
hope you're using on Rhino. You honestly don't even need duration, I run with 75% on my general-purpose build and that's still 22.5s on Roar. If you actually take Primed Cont you're out at 39s. The
default duration is 30s. It's this lack of basic knowledge about the kit of one of the most popular frames, which you profess to use extensively, which makes people doubt your experience.
That aside, in any sort of mission environment where IS is actually
necessary to stay alive, you're going to be manually refreshing that every 10s or so anyways (varying based on how good you are at dodging).
Now warframe is a game where you can custom working builds pretty much how you want. If you can make a skill rhino work in endgame, franckly it's all for the better but that's not what I do.
Yes, in most normal content you can run basically anything and get away with it. Nobody's telling you not to.
I do prefer to use Rhino as I layed it before you ; as an unstoppable tank which, paired with a critbased weapon, can cut through pretty much anything.
In real endgame content there's no such thing as either an unstoppable tank or purely crit weapon-based DPS. Thanks to how scaling works, you eventually hit a tipping point where if you're not either not being hit or in an invulnerable state
you will die, and enemy EHP scales to the point that you
need viral+slash procs and similar types of infinite/high scaling in your cell's bag of tricks to keep killing things.
The only thing that's changed is that there's no longer any real incentive to run missions for 3+ hours.
As for "Rhino who doesn't support etc". I'm not playing as a support, I'm playing as a tank/carry. If a player fucked up that bad he needs to rely on another player ultimate to stay alive, that's not the fault of the tank, really.
Please for the love of god don't think about WF in MOBA terms. It really, really does not transfer over. Especially in terms of "ultimates". If I ever catch someone talking about "holding" Blessing I'm going to reach through their screen to slap them.
An aside: Frost was and still is the god of defense spam because you can refresh globe without needing to cancel it. As long as your cell can keep killing dudes before they get inside and you don't run out of energy, you stay invulnerable forever.