Was the reboot pointless? Yes, but it didn't have to be.
My problem with the ASM Franchise is the same one I have with Snyder's Superman (so far): Instead of actually treading new ground, the ASM franchise just follows the latest CBM fad. And when it did something different, it was usually bad, like the overfocus on Peter's parents, or the Osborn stuff.
ASM1 was in many ways, a watered down version of Batman Begins. Thing is, that tone doesn't entirely fit Spider Man, and it kind of showed. Add to that a weak story the regurgitates an origin film we've already seen, weak action scenes, etc, and you have a film that wasted its talent.
The Avengers comes out, and Sony obviously rethought its approach. Now its about universe building and a colorful palette....just like the MCU. ASM 2 ended up being worse than ASM1, and not even Garfield and Stone could save it.
And if there was any ray of sunlight in these films, it was Andrew Garfield and Emma Stone. If this franchise isnt pointless, its only because Garfield and Stone, two people with great chemistry, fell in love with each other as a result of starring in these films together. In a way, its good that ASM3 might not happen, because I don't see how good it'd be without the Garfield/Stone combo.
This reboot franchise would've been worth it if it approached CBM genre in a fresh new way, and wasn't micromanaged by Sony.
Also, they should've brought someone in to do fight scenes, because there is not a single memorable fight in this series. Its even more apparent when every Raimi film had a memorable fight by comparison.