It's a camo clothing party! Solid earth-toners need not apply.
You can sit for hours with your head braced to your knees by your hands. Look at the guys with binos - much easier, steadier and less fatiguing to sit with elbows on knees versus sitting upright. Lots easier to sit that way with an angled scope vs. straight.
Angled scope means smaller/lighter (and cheaper) tripod. This is a good thing for backpacking.
Angled scopes typically have a rotating mounting collar. Rotate the scope 90° if you insist on looking through it straight.
Angled for the win.
Three Swaro spotters, two strait and one angled, which position looks more comfortable?