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Whether you take your game library between PCs or want to cut down on load times on your console, a fast external drive is a good thing to have. Micron announced today that they're entering the market with their brand new Crucial X8 Portable SSD. With read speeds of more than a GB/s, they aim to deliver premier performance for the value.
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Usually internal hard disk is better for PCs because it's cheaper, but there's no reason why you couldn't use an external disk if you want to.
It's not just that it is a lot more expensive than comparable performance in an internal SSD would be, as Vrika pointed out. USB also tends to be higher latency and less reliable throughput than a lot of internal buses, so it's surely going to be slower than an otherwise equivalent internal NVMe drive, and may also be slower in real-world usage than an internal SATA SSD.
Even so, it's going to be massively faster than any hard drive, whether internal or external. There are already a lot of external SSDs on the market, so it's not like this is a new class of product.
IMFT introduced Xpoint years ago, and Intel brought it to market as Optane. Micron announced QuantX years ago, but took more than three years to announce an actual product, by which time, they dropped the QuantX branding. Well, they kept the X, I guess.