I feel ya on that. A few weeks ago I was trying to evolve a few mons in Area Zero, and even though I tried to avoid it, a Girafarig entered a battle with me. You guessed it - shiny. Literally tried to avoid a shiny because there's barely any difference you can see from a distance when you're concentrating on something else and there was no shiny noise to let me know.
Played Legends Arceus yesterday and dropped down mid-flight because I heard the shiny noise. Now I have a shiny Stunky that I otherwise wouldn't have. It really does make all the difference.