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How are NFTs different from Bitcoin at all? The value of each is based only on speculation, they're premised on a manufactured scarcity to give the impression of being valuable because they are somewhat rare, people are only interested in them as a get rich quick vehicle... the comparison is perfect. I see no difference between NFTs and Bitcoin, so for someone to criticize NFTs as an investment vehicle and not crypto is the peak of cognitive dissonance to me.
Well, to give you a short answer, Bitcoin is a payment method, and NFTs are far from it.
You can buy BTC for $48k apiece, and since Bitcoin is accepted by 15,000 businesses worldwide, including major companies like PayPal, Microsoft, AT&T, Starbucks etc., the same day you can pay for their goods and services at more or less the same rate. Theoretically, we could be doing the same thing with NFTs using barter system, but good luck in buying an NFT for $48k and expecting provision of goods and services for this amount.