Bugs, enhancement requests go here - https://github.com/e14n/pump.io/issues - although you really are incredibly naive if you really believe Evan isn't aware of all of these functional gaps between identi.ca and Pump. The lack of groups, hashtaps and bridges are all existing issues. As for why he didn't implement them all before the migration, well you'll have to ask him but I suspect it would have delayed the migration by 12 months and he couldn't wait 12 months.