Smalltalk got a lot right very early on that got adopted in bits by everyone eventually. The idea of a fully interactive IDE, designing systems as distributed objects that exchange messages, and so on.

Unfortunately parceling it out and fudging it killed a great concept and we got stuck with corporate driven "OOP" that lives on in Java, Kubernetes, etc.

It's a wonder the people at PARC divined so much of great conceptual designs and other companies got to profit from bungled versions thereof.