I started playing at the end of 2015. I saw the game go through a bunch of different forms. The people pulling higher tier weapons into lower tier bots were mostly doing all-in strategies around that weapon, because they didn’t have enough budget left for much else, IIRC. But it was going to be mathematically impossible to support to 10 tiers of 10v10 matches as the game went on anyway, and it became a really fun competitive game with no tiers in early 2017. Then they went for some kind of half-assed return to tiers at the end of 2018 that made no one happy.