There is need for you to be specific when mentioning cryptocurrency because there are lot of coins in the space perhaps it is a Bitcoin discussion thread hence the need to more specific as not to deviate from the concepts of the thread which is basically emphasizing on Bitcoin, if it is Bitcoin it is best you say Bitcoin than generalizing your narratives with term cryptocurrency. However, volatility is an inherit trait of Bitcoin that real long term investor tend to get used to and maximize every buying opportunities they find in the market.
I also quite agree with you on this one because Bitcoin does not have to be replaced with other words as mentioned, moreover saying the word "Bitcoin" is not too difficult and will also be easier to understand by everyone who reads it in any thread including this thread where every discussion is more directed towards Bitcoin. In addition, the word cryptocurrency actually refers to something general so it does not refer to one coin like Bitcoin, so I quite agree with your direction on this one because it makes the discussion not lead to other things that may be less necessary to discuss here.