Most of the day traders lose.
Many are just optimistic with their experiences and despite that many of them are losing, they've got passion for what they do.
And that's why many day traders are also prioritizing just to have more in their portfolios.
There are traders who lose, but there are also traders who win. Most of my friends are day traders, but sometimes they do scalping. Most of them don't have one strategy because there are times when day trading is not going their way, which is why they will scalp on that day.
It really depends on the trader what he prefers, but most traders who make trading their side hustle do this because they don't need to keep watching the chart all the time, all they need is an hour or two on a day to plot their entry, but that doesn't mean that it is more profitable or has a higher winning percentage, it is just where they are comfortable.
Of course everything that can be profitable will definitely have a level of risk, therefore as you said there are winners and losers in trading. For a day trader I agree with you, which is very true they do not only use one strategy, but maybe there are several or even very many, because in every day maybe the market will not always match what they want, I mean if they only have one strategy then it is unlikely that they will be able to get daily profits according to their targets because the strategy they have may not always match the market conditions every day, so to complement it they need several other strategies that match the market habits and with that maybe they have a good chance to be able to keep earning daily income. Well and if maybe their strategy is limited maybe they can take over the trade for scalping, that could be a good option for the market that day that does not match their strategy.
Yes, it is true that the technique may be enough to facilitate us, because it is true that sometimes constantly paying attention to the chart is not good and may make us blunder and make the wrong decision because our brain also has its own capacity to accommodate very complicated movements there, so rest is also needed, this is a pretty good alternative to choose.