That isn't remotely the case. Plenty of experimental / one-vendor features have been released and later received wider adoption without fundamentally breaking the user's experience.
I.e. before we had indexeddb, there was websql. The whole PWA slew of features (I.e. service workers) can and are used without breaking user experience.
There can be bad implementations too- youtube's awful performance due to their early version of the web component spec comes to mind- but these features arent really akin to the olden days of ActivX / IE dominance, since they are single purpose and not opening up an entire foreign interface.
I.e. before we had indexeddb, there was websql. The whole PWA slew of features (I.e. service workers) can and are used without breaking user experience.
There can be bad implementations too- youtube's awful performance due to their early version of the web component spec comes to mind- but these features arent really akin to the olden days of ActivX / IE dominance, since they are single purpose and not opening up an entire foreign interface.