....is there is less to chisel. A disadvantage, in my hands, is the unexpected appearance of some grain structure that results in a ragged cut (tear-out) on the edge where it shows.
If I am working with some complex grain that may split at the edge, I will cut the panel an inch or so wide, then trim off the entry point with the table saw.
On a serious note, it would not have occurred to me to tape before routing. Apparently it works? My misguided thought would have predicted the tape would gum up the bit and lead to burning. Not the case. So, the tape cuts clean at the edge?
I don't know, but I tend to put tape on edges where I'm afraid I won't get a clean cut or tear out.
When I routed the DT's on the edges of the shelfs, I put tape on and it did gum up the DT bit a little. And I got a fuzzy cut, maybe because it's an old bit and maybe not so sharp anymore. So instead, I wet the edges with mineral spirits to see if that would produce a clean cut and it did.