half of all supply mined within a year.. seriously?
You better check your math.
TFT was the one who added the 'feature' (bug) to change it from 120s to 60s which caused it's own set of problems. It since hasn't been corrected. It's one of the reasons you saw so many orphans- verification is expensive, that wasn't optimized, neither was the daemon, etc all CN coins had problems but XMR had issues even more so with introduction of 60s block. When XMR was hijacked from TFT, the new devs made no effort to fix his questionable changes, Those params were left the way they were, despite there being arguments against them they were left to stay . Why even choose it? why keep it.
Because some changes are more risky and disruptive than others, and need to done with greater care and planning. Some of the changes you mentioned, such as not being optimized, were fixed relatively quickly. Others will be fixed in due time, and obviously the experience so far shows that the coin can do quite well, thank you, despite not having changes that you apparently don't fully understand pushed out too quickly.
(Good) software development is hard, okay? Are you actually a software developer in any way? Because frankly you sound pretty ignorant about this, even if you make some other good points from time to time.
"You better check your math." < numbers may be rough, I'll correct it and apologize. could you post the exact figure?