The original bitcoin was intended to be a proof-of-concept experiment. It deliberately had a finite circulation to prevent inflation, and a declining block reward (which is where new bitcoins come from) to encourage early miners to participate and secure the blockchain.

New and improved versions were supposed to remedy whatever problems were exposed by the original. For example, a 1 MB block size turned out to be too restrictive once many people started using it.

New cryptocoins do exist, but way too many of them. 80% of the crypto market is represented by 6 coins, and the other 23,000 account for 20%. Most of them don't do anything new and improved, so we called them "shitcoins" because they "don't do shit" for users.

The so-called "stablecoins", whose value is closely tied to the US dollar, now account for 84% of total crypto trading volume. They are now the currency that people are using day-to-day. The original bitcoin and a few of the others are the "store of value" coins, like gold or real estate for everyone else. Not something you spend now, but hold for later. In fact, I never spent any of the bitcoins I mined. I held them for about 7 years and then sold them at a profit, not unlike I did with various homes and other property during my life.

NOTE: Despite my good experiences with Bitcoin, I now warn people away from crypto as a whole because it has too many scams and losses from hacks.