That's pretty tactical decisions, usually made in a time window of like 20-30 seconds top. Takes like 40 second to reach more than half the map from the base. Fighting decisions usually also get tactical. I would say that 90% of the game deciding decisions have a time window of less than 30 seconds to make. 70% are in a time window of seconds. You don't make a strategic decision to fight ever, you make tactical decision when the map looks fitting. If you take strategic fights because of long term strategy (instead of deciding tactically) in Dota you will lose.
I feel that I generally know where I will play well in advance. Like before the game starts. At this point it just seems like semantics of what we think of strategy vs tactics if that's the case. As I think many of the things you see opportunistically while I decide I know when I'm going to fight in advance and I put myself in opportunistic positions at those times.
