Hmm. If you're trying to practice/learn a hero or role or in ranked, I'd assume that could be risking sr and other's. There are casual modes and a reason ranked doesn't unlock until you're level 25 imo not like this game is necessarily hard to pick up compared to most but you still need a decent team. If you're good only at a specific role as well its not necessarily a bad thing (though great flex players are amazing in any game, but hopefully a player should at least be able to swap if needed for situational counter or diversity of strat within their role.) it helps to get a reliable stack so people can coordinate, strat or fill other roles, to trust your team and not ruin hero compatibility. Casuals also are good for practicing team synergy in general for stacks as well as not risking sr.