There is NO rule that says you cannot enter a beer in a certain category. It is 100% within the "rules" to ENTER a beer in any category you want - even if it is outside the "guidelines." It is absolutely "legal" to enter a pilsner as a stout.
This is the crux of the issue.
If there's someone who believes the rules should be changed, they should put forth a cogent argument for discussion.
Try this for an example: putting a Surly Bitter Brewer ale against a Tetley's Smoothflow. I prefer the Surly, as a beer, generally, and would bet it is judged superior as a beer by most folks, but even Todd the brewer would acknowledge that it is not to style, despite the ABV being close to or in the correct range. Should that win a competition for a bitter where style guidelines are used? No. I'm no style Nazi, but the argument for compliance with style guidelines boils down at some point to attempting in good faith to properly classify the beer when submitted, so it can be evaluated against the appropriate style guidelines and the other properly classified entrants. Should my reduction boiled 60 Schilling Scottish Ale be forced to compete (within the 60 Schilling subcategory) with a 70 Schilling Scottish Ale improperly entered as a 60; if so, what about a 90 Schilling?
That said, I don't put it on the judges to catch something as minimally deviant as a higher than permitted ABV on a relatively low alcohol beer.