I disagree with you.
I quite like the way they went with the jutsu activation.
It's more of an "unique" spin to ability activation when compared to other games (majorly MMORPGs).
Whilst it can take 'some time' to remember jutsu combinations, keep in mind that you don't actually have to remember all of them, I doubt you'll always be using every single jutsu that you find / unlock (talking about the future, for now it's not that hard to memorize the few jutsus we have.)
Of course you were merely stating your opinion, I however am doing the same.
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