The main problems adobe flash on Ios are in multiple disagreements with the leadership of Apple. As early as 2010 Jobs described the Apple policy regarding flash. Why is Apple vs. Flash:

1. “Open”

2. “Full web”

3. Reliability, security and performance.

4. Short battery life

5. Touchscreen

6. Development tools

7. Conclusions

4. Just business. No one wants to share the market of development of applications.

Since then much has changed. Creating Cuts version of flash - the first step of these companies to meet each other. But at the moment, the features of flash is better implemented in Safari and HTML 5. I think that it is inappropriate now to install flash on iOS. But nothing prevents you to try it and form your own opinion. I am happy to read it here.