Being a responsible gambler is not as tough as people think, yes anything that involves money comes with lots of temptations that could make one greedy but if you're determined and set your standards then stick to I don't see why a gambler won't do it responsibly, "it also involves being proactive, setting a budget & maintaining an entertaining mindset". Also those stuffs you've mentioned are the characteristics of a responsible gambler and if any gambler can constantly maintain those principles then it's won't be tough being a responsible gambler.
This responsible gambling of a thing is only very easy for gamblers that have control over any activity they they involve themselves, it is easy for some people to be responsible gamblers while to some persons it is a very difficult personal task but what I understand is just the approach and the mindset of gamblers generally that determines if a gambler can be responsible or not, to some gamblers, gambling is just for entertainment and fun nothing much, this set of gambler bother less when they lose although gamblers that fall within this category is not much others are gamblers that gamble with what they can afford so that losing with not seem to them like the lost a relative, those approach you listed will be of immensed help for a gambler to control excessive habit of gambling.