Yes, it's a mixed bag with some things better and others worse. But having a great JavaScript engine with the JIT enabled is pretty important for many applications.
But breaking up the browser into different processes and communicating via messages and sharing textures in GPU memory between processes (IOSurface, GL_TEXTURE_EXTERNAL_OES, etc) is the inextricable direction of progress, what all the browsers are doing now, and why for example Firefox had to make so many old single-process XP-COM xulrunner plug-ins obsolete.
IOSurface:
https://developer.apple.com/documentation/iosurface?language...
https://shapeof.com/archives/2017/12/moving_to_metal_episode...
GL_TEXTURE_EXTERNAL_OES:
https://developer.android.com/reference/android/graphics/Sur...