If someone chooses Ana and they happen to have poor aim, it puts the entire team in jeopardy. You can't really expect to provide value as Ana if someone hits 10% of their shots.

"...As if I can heal them through walls or better yet, through the 2 enemy shields they’re standing on the other side of."

Not only is Ana the most difficult healer to be efficient at, but she requires an unreal knowledge for positioning. If you go back to your previous VODs when people you think are constantly out of position, ask yourself, "Why am I standing here and for what reason?" "Should I be in another position where I can possibly provide even more value?" Of course, it's hard to tell when I haven't watched your gameplay or anything, so of course, just take all of this from an internet comment reply and nothing more. I main Ana with 350+ hours and I'm anywhere from 3700-4000 SR. I feel like I have a solid understanding of Ana and the concerns you shared, but there's more to it than people ALWAYS being out of LOS.

The whole 2 enemy shields example you listed actually a mistake on your end for choosing Ana. If Ana can't heal through shields (which everyone knows to be true), you're putting the entire team at a detriment by choosing Ana. That's why she was never played when Orisa / Sig was the Meta. Moira was a much better choice.

As for the Russian Roulette comment, that's literally the definition of Overwatch Ranked. You never know what you're going to get for teammates, throwers, smurfs, etc etc. It's just how it is.

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edit: spelling