It is true that money should be used in day-to-day needs to be stable, and I think that bitcoin is great for savings or investments.
wanting bitcoin price to be stable at this point is like wanting a toddler to run in the marathon!
bitcoin is still that toddler who is in its early stages of lifetime. it needs a lot of time and growth before being ready for that marathon and have a stable price. good news is that if you look at the past 9 years you can see that bitcoin has been on the correct path to become more stable and have less volatility and be prepared to be used as a day to day currency.
If you think on it, it may be an advantage but according to other stable products in the market it is considered as a disadvantage. Bitcoin is advantageous when its value falls and again goes high and when high after that again falls down, so all these fluctuations are good near those investors who find it difficult to buy Bitcoins. For those Bitcoin is an advantage.