The first blockchains like Bitcoin were created more than 10 years ago. Due to their age, they are not performant enough to handle the needs of modern applications. For example, Bitcoin can handle only 7 transactions per second, which is not nearly enough to meet current demand. As a result, transaction times have slowed to a crawl. As the number of pending transactions has increased, so has the cost of transaction fees, and paying for individual transactions has become completely impractical. It's ridiculous to pay, for example, $10 for a single transaction.