No. Not at all. If you know when the light seal will fail, you must be psychic.
Let's put it this way: is it possible to regret putting tape over the opening? It sure is possible to regret not doing it.
I can not for the life of me understand why you are getting so much flak for what is a really smart move...
I have 14x A12 version III film magazines, I have replaced the light seals on several of them and do inspect those seals on a semi regular basis.
However, I also spend a ton of time and often significant money in making images in the great outdoors, often in very bright conditions like full sunlight on snow. If I deem the light blaring into the dark slide area of the camera to be a potential risk to an otherwise great image, you had better believe I am putting on a strip of gaffer's tape or at least using my ball cap or other hat over that area to prevent that light from sneaking in when the dark slide is out.
Just like in using large format, you use common sense and experience to prevent otherwise preventable issues with your photographs. It's just the right way to do things if you are serious about coming home with successful photographs.