I think that more experienced players should have a strategy, how they choose bets and how they follow a set of rules and do not exceed the risks. For people who play only for fun, it is clear that they will not care about strategies, because it takes a lot of time and implies the possibility of making gambling a way of earning money, which is actually very difficult. Maybe there are successful players who do not have a strategy, it is difficult for me to judge because I have not seen any statistics on this matter.
I don't think that those who play for fun do not care of strategies, things can switch along the way for any player, and it's risky to be unprepared just because it's for fun. They still work hard on their limitations and money maintenance.
Though the experienced players tend to make out strategies that look like what get them wins, but most often it does, but through limitations and selective financial managements. And all gamblers need to emulate such strategies be it fun or non fun players.