If we consider sigfigs, then isn't 100 and 100. two different numbers given one has a single significant digit and the other has 3? For 101 and 101. it doesn't matter because both have 3 significant digits. Then again, one may argue that it is better to write 1e2 and 1.00e2 instead of 100 and 100.. It also avoids the weirdness of the double period if the number with a dot ends a sentence.

On a personal level, I also don't like ending a number with a . because my brain immediately parses it as a sentence ender and it interrupts my reading flow.