The Sharingan is a dead sexy bloodline. But because it's a bloodline, people come prepped for it. And in the more than forty years since the Uchiha have fought Konoha's wars, people will have come up with a LOT of counters.
Note how canon Zabuza used Hidden In The Mist to deprive Kakashi of the use of the Sharingan. Or how Deidara spent years training his sight to look through genjutsu. Or how Danzo disabled Shisui despite his having a Mangy Eye.
We aren't going to match Itachi or Tobi by simply going more Sharingan; they have decades of experience on us, and we'd be playing perpetual catchup if we try that route. We have to think a little laterally.
So more Speed. More Intelligence. Better Chakra Control. More holdout techniques that can't be disabled by a flashbang.
This is a bad argument for a number of reasons.
1) Planning, at this stage, against the like of Itachi, Madara, Tobi, Danzo, is a folly. They'll gank us no matter what we try, bloodline or not. Speed? Tobi could fight as equal against Minato. Chakra control? Doesn't matter if you don't have a good enough sharingan or some other cheat against Mangekyo genjutsu. Etc, etc, etc.
Against most opponents, use of sharingan is absolutely a good idea. In fact, I can think of very few, if any situations, where it would be disadvantageous to use sharingan.
2) While absolutely, ninjas have developed at least some counters to sharingan, as Uchiha clan didn't completely dominate the world in the warring clans era, they were still one of the two most powerful clans, and remained a powerful ninja clan up until Itachi and Tobi killed them all. This tells me that Uchiha-style combat (remember, not all Uchihas had sharingan) remained effective and wasn't rendered obsolete.
3) It has been four years since Uchihas were a thing, and they aren't really a thing right now either. Most people wouldn't expect to fight Uchihas and wouldn't have a counter ready.
4) There's a difference between reliance and over-reliance on one's bloodline. Same with specialization and over-specialization. Hisana, from what I observed, wasn't over-reliant on her eyes. They are a booster, but she is training in other ninja arts, and training hard.
My point is, I guess, that thinking that in most situations sharingan would not be an effective force multiplier if faulty, and that, while an ideal ninja would be able to fight blind (or lacking any other sense) and would be an absolute generalist with a counter to every situation, belief in and inclusion of sharingan powers as a core element of her fighting style (and even that is arguable) is not the most important and general issue Hisana has as a ninja.