People actually don't know how important it is to wait for the right set-up, some traders think that the more you trade the more money you make which is very much unlikely, trading doesn't work like that, you might make a lot of money from 5 to 7 trades, and use just only one trade to lose everything including your initial magin.
As much as I think your idea about having many open trades looks bad, I don't really think it's really that bad to have many open trades as long as you can manage. Maybe as a new trader, I will say you don't need it because might not have understand how the market works but a professional trader can has 6 open trades, 3 can give him each 20% each and the remaining 3 can give him 5% each. When you do the maths, you will have 60% profits and 15% losses. If you subtract profits from loss, you will have a realized profits of 45% for that day, I hope you see why some traders has many open trades.
But waiting for the right set-up gives you an edge in the market, when you trade only when you sees an opportunity, you will mostly comes out profitable, as long as you knows the craft a little, but probing the market every now and then will only make you lose money, because trading is more of patience and knowledge.
Your idea is cool but works very well during the bear market. In a bull run where you can literally see all coins becomes greenish in profits, it will be difficult to applied them here because what you are saying actually works better in bull run but you need to also applied risk management into your train, it's not every trade you see too good you should put money into, you might experience bad result.