Why ECC is not widely used?

Could you elaborate on the reasons why Elliptic Curve Cryptography, or ECC, is not more widely adopted despite its advantages over traditional cryptography methods? It's known for its smaller key sizes and faster processing times, so what are the main obstacles preventing it from becoming the norm? Are there concerns over security, compatibility, or something else entirely? Understanding the limitations of ECC could help us identify potential solutions and pave the way for wider adoption.