I swore coping baseboard was a beginner's cut until a 12 foot outside corner humbled me
For 8 years I've been telling guys that coping is the only way, no question. Then I hit a 12 foot run of 5 inch base with a 47 degree outside corner in a house near Akron where the drywall was bowed out almost 3/8 of an inch. A plain miter and a sanding block would have had that joint closed in 5 minutes, but I spent almost 2 hours fighting coped cuts that kept opening up a gap at the top. I finally swallowed it and cut it at 47.5, glued it, and it closed up like a zipper. Anybody else switch sides on this depending on the wall, or am I just getting soft in my old age?
Funny how the thing you swear by for years turns out to just be the thing that works most of the time. Same deal with me and always boiling pasta, then one day the box says 9 minutes and turns out the box was right. Sounds like you just finally met the wall that didn't read the rulebook.