Well I do agree with the OP. When it comes to major house or camp maintenance projects I don't kick the can down the road. Do it right and live in peace for a long time. Off with the old, new ice guard and paper, new flashing and new shingles. Sleep well and dry for a long time.
Shingle over the old? That is a substantial weight subtracting from snow load margin. And what if that 30 year new roof only lasts 12? Now you really get to pay the piper.
BTW, my wife and I did the roof on our Welch Island cottage 15 years ago and we did it the right way. Extra work but done right, done once.
Just my 2 cents.
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