Re: Some suggestions from a proud sapper
1) I think this is more of an issue of the height of the object. However on maps like orc burgwall and alchemists citadel the point 3 for each allows you to get in and open the gate if your enemy isn't paying attention. Its great tactically especially with your point 5 being an issue.
2) Everyone can die pretty quick to an inquisitor. I dont see inquisitors dying as much. They are the ones who are supposed to deal with the support in the rear though. so they need to be able to get in do their job and get out. On the PoC they're not as useful.
3) I like playing tank but one of the more frustrating things are the elves... the silence ball sucks your mana right down. Additionally any player with his magic shield up can still be hit by normal attacks. A good combo is icewitch zerk. The tank has to decide which to block. Either way he's handled. The magic shield is a great powerful ability... its easy to stop though if you know how.
4) been talked about
5) I agree with this and was thinking about making a suggestion. in lower tiers they survive just fine. However after casting/commentating the summer league i notice how easily they go down to top tier players. A possible fix to this might be setting the health higher for different tiers or maybe having a modifier for how well you can kill buildables much like mastery.