The bear and bull both hold relevance and are important to the market. The bear market creates opportunities for new investors to enter the market while without the expectation of the bull, investors will never take advantage of the bear market. So they are both important to the relevance of one to another and to the market. A market that is only in the bull will not permit opportunities for investors to get into the market, and a market that is only bearish will not encourage new investors to join.
Both markets are significant in any market, as you will see how a certain project evolved throughout its lifespan.
If you believe there is future for example in btc market, what you will do is accumulate while it is in bearish season.
Because you won't invest if you think there is no hope to recover or increase its price in the coming days.
You will also distinguish these 2 seasons, if you will compare their market performance, in this case, their history of prices.
But the fact is, no one is defining a bull or a bear market. Only people are giving it a certain distinction based on the prices.
So if it is all bull market, how can you distinguish a bear market? So yes, we do need both to identify which ones we are in right now.
And from that point, decide whether we invest or not in any type of market. It is on you how you will strategize to get profits later on.