What do most quit-smoking apps get wrong?

I’m building a 10-week quit-smoking plan and I’m trying to understand what actually helps people stay consistent.

Not here to promote or drop a link. I’m looking for blunt feedback from people who have tried to quit.

A few questions:

1. When you tried quitting, what usually broke the streak?
2. Did tapering down help, or did cold turkey work better?
3. What kind of reminder/support would you not find annoying?
4. Would a structured 10-week plan feel useful, or too slow?
5. What do most quit-smoking apps get wrong?

Disclosure: I’m building an iOS app around this, but I’m mainly trying to understand the problem better before pushing anything.