Because parrot development was mismanaged and ran into ground. Similar to perl5 management in the last 15 years.
It is essentially impossible to do so, as the problems are systemic and run extraordinarily deep.
Would you honestly consider any possibility of working on a "level" with people like this: https://www.nntp.perl.org/group/perl.perl5.porters/2018/01/m...
So I can't fault rurban for walking away. The project still has merit. Its current leadership - none.
Their former pastime was that my criticism had no technical merits, they now changed course and claim that my criticism is uncivilized. Well, this is a good strategy to hold the community together. Create a common enemy. Get him fired. Collect the angry mob and give them powers.
https://www.nntp.perl.org/group/perl.perl5.porters/2018/01/m...