I think that depends a lot on how you approach your party and paradigm deck. I don't know how Rowan did things, but what I've seen from other players who shared his viewpoints was a rather static approach to party choice and paradigm deck building. These players would tend to pick a party and put together a paradigm deck designed to handle all encounters, and then rarely change it outside of major shakeups. The problem with this is that there's very little overlap between the types of paradigms that work well against bosses and tough encounters and the types of paradigms that work well against weaker enemies and easier encounters. Thus, the decks tend to wind up with (typically) 3 paradigms that are well suited to hard encounters, 2 paradigms that are well suited to easy encounters, and 1 paradigm that functions passably for both but isn't great for either. An example:
Lightning/Fang/Hope
RAV/COM/RAV
RAV/COM/MED
MED/SAB/SYN
COM/SEN/RAV
COM/SEN/MED
MED/SEN/MED
If your deck looks like this and never gets tweaked, then you have very few reasonable options during any given battle. In order to experiment with reasonable-looking strategies, you'd have to alter your paradigm deck, and that would indeed require you to retry the battle.
On the other hand, if you view your party and paradigm deck as mutable resources, then you have room to set up a much more flexible deck for the type of battle(s) you expect to face. Thus, for fighting the wandering mooks, you might have a deck that looks like this:
Lightning/Sazh/Vanille
COM/SYN/RAV
RAV/RAV/SAB
RAV/RAV/RAV
COM/RAV/SAB
COM/COM/RAV
MED/SYN/MED
With 5 offensively oriented paradigms, multiple options for deploying a SAB, SYN, or both, and nuance in your chain-building and damage-dealing paradigms, there are a lot of offensive strategies that you can explore without changing the deck at all. Granted, with only one defensive paradigm you would struggle with this deck against a difficult encounter, but that's easily remedied by switching things up:
Sazh/Fang/Vanille
SYN/SAB/MED
SYN/SEN/MED
RAV/SEN/RAV
COM/SEN/SAB
COM/COM/SAB
COM/COM/MED
Again, you have the ability to explore numerous viable approaches without altering the deck, and, of course, you also have the ability to alter the deck if you lose a battle or decide that there are too many inefficiencies for a given battle. For that matter, it's also reasonable to pop into battle without bothering to set up, cast Libra a couple of times, check out the enemy info pages, and then Retry to set up with a lot more information than just what the enemy looks like.