It is a tough question to answer, but take this for instance, if you compare the master league to well diamond and below.
In the Master league, we would often wait 1-2mins before even touching an objective if it is a 3 lane map.
This wasn’t a written rule, but usually everyone has something to do around then, like clearing camps (Making passive pressure on lanes) soaking a couple of waves of minions so we lose as little xp as possible while away from lane.
Sometimes we would even just say “Well screw it, we won’t win this one either way, might aswell siege our hearts out while the enemy team is away from the lane”.
This would often result in 1 person on the enemy team taking the objective alone, while the rest of the players would soak up.
Compared to diamond and below, where you often just rush the objective as fast as possible and headbutt each other til one of the teams win the objective.
Now this doesn’t mean that if you are in Diamond or below that you SHOULD stay away from the objective just to soak, because that would just result in your team going 4v5, because people are way to thickheaded to actually adjust to whats going on when playing at those ranks, which then eventually would result in you getting a storm of toxicity in your way, not that the toxicity matters but your team would probably be typing more than they would be playing.
This being said, it is an impossible question to answer what you should do in any circumstance, because everything is situational in HOTS.
From your rank, to your team, to your comp, to the enemy comp, to the camps taken, to the camps not taken, to the waves of minions, to the keeps you have EVERYTHING matters, the golden/fine line here is finding out when and where you should be and at what times.
I know this doesn’t help much, but that’s just the way it is.
Once you find that fineline, you can even smurf as high as Diamond without problems.
Another noticable thing between master and other leagues is that takedowns go from around 3-5 takedowns during a master match, while other leagues often have 20-40 kills.
XP is the nr.1 most important thing after sieging, and a single takedown is about as much XP as a wave of minions, so if your running around the map hunting for kills, your litteraly saying “I wanna MAYBE get XP, or MAYBE give the enemy team XP, rather than just safely soak up the same amount in my lane without risking the game”.
Often ranking up is learning to just play safer, learning that risky plays is NEVER worth it unless you wanna play every match as a russian roulette match.