Level scaling in any shape or form, i.e. enemies' levels (or stats or power) change based on your level, is a disgrace. 
Why? It's a little immersion-breaking if you actually see enemies scale 
 This is not about seeing or not seeing LS, which is irrelevant. Just like cheating on a test is wrong whether someone sees it or not. 
The design philosophy behind level scaling is shallow, banal and cheap. It diminishes c&c and player agency.