Filled supports? Bad idea? Hurts low ranked ADCs?

Hey so I've never done this before but I think this is a issue that riot needs to face themselves, so I'm a bronze 1 and I usually try to play mid most of the time so this isn't much of my issue but most of my friends who are also bronze or silver like me hate this issue. Filled supports. My friends who has played league with me since we both joined hates this. Her supports are always filled which is ok but then it gets super serious in situations like ranked prelims or promos. (She mains AD carry) My argument is you shouldn't have to play support if you don't want to. Of course riot made the fill system because it cuts down queue times and kinda forces you to get out of your comfort zones, but it hurts young ad carries. If the support is not reliable and is only playing the role because they didn't get the role they wanted due to autofill protection then they shouldn't have to play it. Many of my friends agree that waiting an extra 10 mins because someone still needs to queue support is fine because we have alot of time on our hands anyway (I mean if your going to queue a match you at least have a a couple hours to spare due to long game time anyway, that or your a complete idiot who has to dc 30 mins in :/) I think riot needs to address this issue a little bit more than they already have and perhaps make some more adequate changes. Though I am still new and I haven't put too much thought into this so I'd really like to hear what other people think. so... Whaddya think?