Let be honest and be realistic and not putting our opinion from a place of emotions and sentiment, Bitcoin is favorable by everyone and even had the first mover advantage but can't be used as a day to day payment point for merchant, it will cause lots of problems and disaster on both merchant and spender. The fluctuation of price will literally be the source of problems not decentralization principle.
Stablecoin will literally be the best ever used assets for day to day payment, nothing would really be better than that, if regulation by the US citizens on USDT and USDC will be problem, then DAI will work since it's a privacy based stablecoin.
Indeed, if we are not biased and are willing to face the fact, stablecoin are the best and most suitable asset class for everyday payment, not bitcoin or any altcoin. With their stability, low transaction fees, and easy scalability to meet large payment need, stablecoins are well suited to be a medium of exchange, rather than a highly speculative asset like Bitcoin.
Even bitcoin investor like us feel uncomfortable using bitcoin as a means of payment. So how can we expect ordinary people to accept and use it for everyday transactions?