In my experience those optimisations tend to never happen unless they make the app unusable, leading to tons of WebApps working like crap.Probably you work on a company that budgets a lot to eorgormsnce optimisation, etc or you just care a lot about it, bit in my experience most companies and most developers don't have the time or motivation for it. I'm tired of sluggish crap.
React is: always right, sometimes slow
Vue is: always fast, mostly right
I prefer fixing performance bottlenecks later over having any doubt about the correctness of my view or debugging why this one property only sometimes becomes reactive. But I can see how others would feel differently.