For someone trading conservatively, focusing on a few trading pairs is much better, especially high with high marketcap coins couples with higher time frames is the bomb. The only disadvantage is maybe lower PnL over a long period of time but the risk of losing a trade is way so low.
People opt for so many trading pairs because they feel they might at one time land on a gem that can easily go x10 in a few days. Of course this happens at times but not always. To answer the question, I think it just depends on one's strategy
The frequency of that not happening is so high that there is no reason for people to think that it would be a good idea. They think that they can make x10, but the amount of people who lost more money trying to make x10 is a lot more than people who actually made 10x, which is why I think it should not be all that easy to keep that going.
We should be thinking that maybe we are going to end up with something that will not be all that simple, so we should probably consider that making something that crazy would be near impossible. I personally do not chase those, I try to make very little but quite often, that way I get to be right most of the time, takes very short span as well and the results are nice too.
Best way to go right now would be just focusing on how we could get greater results, it should not be really that complicated and we could make some returns on the subject as well, realizing that things aren't going to be same as it used to be. If we keep on trying to make huge returns, what we are going to be left with will be just a small amount, and we can't really get to a level where it will be just an ordinary situation, it is not going to be a simple situation neither, not at all.