I think the confusion is that your taking it as people (at least some of us), are "stressing" or "complaining" about lights being burned out but thats not necessarily the case. For me personally, it in no way ruins my vacation. I dont spend time staring at them and biting my fingernails getting stressed. It just bothers me that of all the issues that plague WDW, such as the ones you mentioned about food, service, etc, this particular one is such a simple fix. A problem that in the past, was dealt with swiftly if it even occurred at all to begin with, which was rare. Now it seems as if it doesnt even matter to the company.
Its gotten worse over the last 5-10 years and doesnt appear to be getting any better. So now I worry about what could be next. Paint, upkeep, landscaping, cleanliness? It could be anything. And again, Im not stressing over it, but if something so simple as replacing a light bulb does not matter to them, why would other basic chores? My wife asked me to unclog a drain today. I didnt just ignore it because we have another sink she could use. I fixed it. 5 minutes of my time. If a bulb burns out, send someone up there and replace it, not wait until every bulb burns out and then say, "well, it will cost too much time and money to replace them all so screw it".
I do completely respect your opinion and appreciate that you havent exploded and threatened to leave the discussion as so many other people would do in the face of several others questioning their opinion. Kudos for stating your case and not running away.