Really, isn't the best answer to this, the same as the same as the one given about bore snakes?
"When the top competitive shooters start using tape to cover their muzzles, I will consider using tape myself.."
For every fella that says they have shot a group with tape and had no on effect accuracy, there is another that has and found that it did. Kinda like whether or not boresnakes work, or not. Or a damaged crown affects accuracy, or not, or...
And when someone says that all opinions are not created equal...well...that's great.
Just to bring a bit of levity to the whole conversation...
R.