There is a reason for the duo bot-lane and the ADC/support Meta.
The key is that the ADC position is almost always taken by a champ who scales very well with proper itemization and levels, but who will do poorly if they don't have items. They pretty much HAVE to farm early. Kills help, but the key is that they need lots of gold early if they are going to carry the team late. That's why the position is known as ADC or "Attack Damage Carry". They are champs who mostly build attack damage and attack speed items and can carry the late game if they were carried early. They will have abilities, but a large portion of their damage is in their auto-attack.
And most of the people who main ADC understand that problem only too well. If an ADC can't farm, or falls behind on farm, they are often rendered ineffective by midgame when the other laners can squash them like bug.
But that early vulnerability and need to farm means that the ADC has a problem. They need to devote their attention to last hitting, but that leaves them easy pray for jungle ganks or all-ins from their opponent. So the extra champ on the team was designated as "support". They are supposed to escort the ADC until the end of the laning phase and their "job" is simply to keep the ADC alive while trying to deny the other ADC opportunities to farm.
If you select a non support champ (Heimerdinger) and come to Bot-lane with the ADC, you are almost certain to mess up the ADCs last hitting. Anyone who mains an ADC eventually learns a pattern to follow to last hit most effectively, but it almost always assumes that the support won't hit minions unless you have a melee support like Leona or Braum who is using a Relic Shield. An item like Heimerdinger's turrets or a support like Master Yi who will not only attack minions, but often kill them or leave them so low a minion gets the final hit steals the farm from the ADC. It frustrates the ADC quickly.
Then you get those non-support Supports who refuse to ward. I'll admit that when I ADC I rely on my support to do most of the warding early game. I just don't have the spare money to purchase wards every time back as I'm trying to rush I.E and Zerker Greaves. Once I have those I can spare gold, but until then I need every coin so I can keep up or get ahead of the other ADC.
Honestly, if you plan on going bot lane and not-supporting you need the agreement of the ADC or he/she is likely to report you. An ADC who isn't fed almost always takes a lot of abuse for being useless mid and late game and if they feel the "support" was stealing CS they are going to turn around and point the finger of blame there. Some ADCs won't mind. Others will be like me last night when I had 2 games in a room with Heimerdinger non-support (I grumbled, but did not report the player.). Some will just AFK after you disrupt their farming a few times.
My advice to any player thinking of breaking the support meta is to ask first and be prepared to be asked/told to keep to the meta. The meta supports are meta because they offer the most help to an ADC early. bringing someone like Talon to bot lane sounds fun, but he really can't zone the other ADC/support well and offers little to no CC or sustain. (another non-support I got stuck with in a game recently.)