Please add an option to get notifications if questions or answers I've voted on have been edited (and as an extra bonus, commented upon). Right now, notifications are limited to questions marked as favourite. For others, I have to go through my activity to check for responses to my comments, for example. That's time-consuming, and unfun.
No, this would do more harm than good. Some people use up all 30 of their daily allotment of votes on a fairly regular basis. Under your proposal, the volume of notifications would be so large that the whole system would lose value.
Even users who don't vote often will have voted on thousands of posts over the course of several years. Old questions may not generate many notifications, but the ones they do generate are likely to be of little value.
Also, you say
For others, I have to go through my Activity to check if there were response to my Comments, for example.
This won't happen if people write
@Tshepang in their replies. If they're not doing that, it's a problem with user behavior, not a problem with available features, and that calls for a different solution.