Applying only one strategy to all conditions in trading I think is not too bad, in fact if the strategy is carried out consistently then the trading is likely to be successful but back to broad knowledge in trading to avoid unwanted things I think all traders must have that knowledge or learn it. In trading anything is possible to happen and the level of risk for that I think all traders understand and understand that traders must also try to minimize the risk, namely by expanding their trading knowledge.
This is so true, and not many people understand why it's so true as well. However, there are situations that are not that similar, so if you have same strategy for all the situations then you are going to have to find something that works for all of them, which isn't easy. I am not saying that's wrong, I am not saying don't do it neither, I am just saying that it is not that common and it will probably not be done that easily neither, just avoid that if you can and you will do fine.
We are talking about everyone's habit that will not be easy to handle, and because of that I believe that the best thing to do is try to find that strategy which works for every single situation. It may take a long long time, you may even never find it, because I have never found one that works both on bull a lot, and bear a lot.