• Price volatility, Bitcoin has a high price volatility rate that'll makes it difficult to send money and they receive the same value for the money that you were to sending. They either get more value or lower value as the price isn't stable. This will make it difficult for alot of marketers to accept selling their goods & services by accepting Bitcoin.
Price volatility is known and people have to accept price slip during their trade processing time. However it should not be a barrier against trades with bitcoin as a payment method. Probability that price suddenly falls 5%, 10% or 20% during your trade processing time is very small.
A bigger barrier is expensive on chain transaction fee, not price volatility.
• High risk of lost, Bitcoin has a high risk of you losing it when you don't know how to make use of wallets and protect your Bitcoin properly and alot of marketers don't know how to make use of non constodial wallets making it difficult for them unless they rely on constodial wallets.
Bitcoin has less risk than bank. You have bigger risk to lose your money in bank accounts because banks, governments can seize your bank accounts and get your money anytime. With Bitcoin, you have private keys, and you own your bitcoin if you use non custodial wallet to store your bitcoins.