There are no perfect ecosystem on blockchain. Some will have cons as well but it doesnt mean it is called a "disadvantage" maybe we can revise that to flaws which can be amend or improved under different circumastances. Price volatility isnt alone on bitcoin but everything on crypto even stablecoin have their down throat sometime. Scalability still in progress and being improved at the moment. Like the one said above, the introduction of lightning network helps it.