Angled Polish Connectors and DWDM

dear peoples of NANOG, I've always held the -- possibly completely false -- notion that angled connectors (APC) were not idea for fiber spans carrying multiple dense/DWDM wavelengths. However, after copious amounts of googling and duckduckgo'ing I cannot find an opinion or tech note one way or the other. Are there situations when angled connectors are not to be used? Are they 'safe' or even recommended for any kind of DWDM application? I know they're not meant for mating directly with optics, but for panels, x-conns, and distribution frames...? I have this sinking feeling I've been misunderstanding angled connectors all these years. cluebats are appreciated. please be gentle. thanks, aaron