There are going to be 2 new updates coming soon to:
1) help people with pvm who have pets
2) add little more cash flow into the server via another skilling system soon
As for killing bosses, I don't think its "impossible" but just slow. you could kill plenty of bosses with medium gear if you bring food and prayers, but you may not get fast kills like you see with other geared players. Hopefully the coming updates will help with these issues you brought up