When we are in a casino it is always good to take advantage of every facility that the casino offers, be it a demo account, be it fictitious money, all of this must be taken advantage of so that later when playing with real money there is no complaint, that it was not made this or that because I had no way, because that's what the twenty demo was for, so there are no excuses, and obviously the feeling of remorse would be almost completely minimized, which is quite unpleasant to go through.
And add it to what you have said, most people are not patient enough to use the demo account for a very long time to master the casino before going into the real account. Some of the beginners would used only one day to practice the demo and open real account and stated using it and be losing all their funds in the games and blame other people of their downfall. At least, if you want to be professional use two or three weeks to learn the demo and when you come to the real account, you don't have to use big amount but small amount to test the casino if you can play it well, I hope those are some strategies for the demo and real gaming.
That is the ideal, however I know many friends who never use these accounts, they prefer to enter the games with real money, it does not matter that they do not master it, sometimes they are lucky, but every time the game kicks them very hard and it makes them lose money, after they know that they have made a mistake, it is when they stealthily and quietly go to the demo account, but it is nonsense, I prefer to spend as much time as necessary in a demo account, but of course I understand something , the excitement of playing in a casino and the adrenaline it produces, that's what we call "fever" and in the end they play with real money and lose it for nothing.
I prefer a thousand times to play in demo mode, apply all the strategies that I know, because when I go into real mode it is as you say, it always becomes pure nonsense, and it is very ugly to lose money, not because of the game because it is known that it is the way to play, but because of the bugs that were not corrected in demo mode.
I see the demo mode as an aid for the player, I don't see it as something negative, much less as a waste of time, and although we say a lot that it is advisable to use the demo mode, I know that for many players that means something useless that they will not do .
Games of chance in casinos will always be something that means risking money and making things flow in that sense, that is why at least I have learned that money must be taken care of, especially when it is risked, be it in a casino or in a any exchange, that is what we must have as a priority, take excellent care of our balance, because without money in a casino we are nothing, we cannot access anything in real mode, for that detail it is what we always need for ourselves having the option of playing in demo mode, if we play for a long time in demo mode we will see how our balance behaves, if it increases or decreases, and it is preferable to see this behavior with fictitious money than with our own money, it is a great advantage if the things flow like this.