'IMO, the perfective aspect indicates not only some result, but a transition to a new state in general.'
This is something I will try to bear in mind, I think, when looking at aspect. The idea of a 'change of state' sounds more solid than just a general idea of a 'result.'

When I see verbs like почитать vs прочитать I know I'm looking at something which needs to be considered as a special case; a lot of verbs have one imperfective form and a few perfectives, (and почитать has another meaning and it's own perfective too?) It gets a bit tricky for me, especially as many verbs also seem to have idiomatic meanings too.