I cannot find any real reason why you should spend your bitcoins in order to shop online.
In my opinion, Bitcoin has a bigger value than the one right now so it is not worthy spending them for shopping. It is better to keep them in your wallet and consider it as your investment. If you want to buy something online use a stablecoin...
I don't see anything bad in using bitcoin for shopping online. After all, the concept behind the creation of bitcoin promote more of using it for daily transaction than keeping it for investment with the hope of selling it off when the price increases tremendously. Bitcoin is too serve a decentralized digital currency that provide people with secure and anonymous option to FIAT currency, so using it to shop online is really a cool idea