You should know that Bitcoin is an open source project which means it's open to everyone and of course development is a must and if the community agree to something for the better of the protocol, it will be reviewed as "Bitcoin improvement proposal" and and agreed date which modification will be added through soft work which means that even though you don't update your client to the latest protocol, you can still use the network efficiently.

You should also know that the phrase electronic cash is not what Bitcoin is today, it has expanded above that level, lightening network has been developed as a base layer through the native chain and everything is working perfectly, the existence of the other chain doesn't affect the main chain. There have been some NFTs on the Bitcoin which doesn't in any way affect the Bitcoin protocol but it's even favoring the miners who collect he fees to provide maximum security for the Bitcoin chain, everything you see accepted into Bitcoin doesn't in any way affect the originality of Bitcoin.