Isn't speculation and volatility a problem for Bitcoin?
Logically, it should look like a problem but in reality, that's the charm of bitcoin. Speculations and high volatility are linked with each-other (well, volatility alone sticks with bitcoin). This is the real reason why bitcoin is a popular investment option. Just see, one day you can wake up and see 20% growth on your invested capital. If you catch the good moment of fall and open short position in futures trading, even if there is 30% decline in bitcoin's price, you can wake up with 30% profit and even more bitcoins than before.
You want stable coins? There are USDT, BUSD and others. But they aren't popular in crypto world, so you know now.
I'm not going to talk about speculation because it's not unique to bitcoin or other crypto assets but talking about volatility, it's a unique attribute of Bitcoin and the entire crypto market as a whole and I think that's one of the defining factors that makes Bitcoin and all of crypto different from other markets. I also wanted to point out that stablecoins like USDT and BUSD might not be popular to everyone especially people who just buy and old but it's important to people who trade since it provides and option that you can hedge to when market goes sideways.