Have you considered moving over to PostHog given this disparity in features or for your usecase Mixpanel is suitable (especially now with the price reduction)
Even with the price reduction, I am still considering PostHog. I think it makes sense to leverage many of the features that PostHog is offering instead of using Mixpanel + a separate product for handling surveys or feature flags. What makes feel skeptical is the migration effort. I need to do some research about this.