> Ethereum is already much better at it's core

What you and many others seem to overlook is first mover advantage, network effects and most important: trust. Bitcoin is not Yahoo or Facebook, it is not a company product which has to improve and break things all the time.

In the long run Bitcoin is a store of value. That requires trust, which takes time. To gain trust over time it has to move slow and steady because there can be no mistakes.

When it comes to money and trust it is almost impossible to get a second chance (see Terra UST). Just one mistake could result in everyone distrusting Bitcoin.