When I carry my Sig P220 45acp (I guess you could call that medium); it's usually in the colder months on the inside of my jacket. You can buy jackets with inside pockets that open vertically. (Finding a left hand - pocket on the right side; was difficult, but I found some). In the warmer months, I carry a walther or FEG 32acp. And I have no problem carrying it IWB in the small of my back. It's all a matter of training. It's not hard to offset it enough to get more on the meaty part of your butt. Then again, there's the crowd that likes to carry their 1911A1's cocked and locked; which I'm not a fan of. So I guess there will always be disagreements on how to do anything in life. I have learned in my almost 50 years of life that when someone says something is bad or good for EVERYONE; meaning something is definite one way or another; then they are usually wrong. Very few things in life are definite. HOW you carry your weapon is NOT one of those things. Figure out what's the most comfortable and accessible for you. You are the one that needs to wear it and be able to access it when needed. It does you no good to do it the way someone else tells you is the "RIGHT" way to carry it if it's uncomfortable or difficult for you to unholster when you need it. I even know people who don't carry very often because they say it's uncomfortable. Well, that sure does them a lot of good.
The only wrong way to carry a weapon is one that either prevents it from remaining concealed, one that is too uncomfortable to wear, or one that doesn't allow you the quickest access (For you) to the gun when you need it. This is also another reason why I carry a walther style 32acp in the warmer months when I'm not wearing jackets, coats, or other bulky clothing. I can place the gun in my pocket; inside waist band on my side; inside waist band towards my back; in an ankle holster; inside suit jackets; etc.... Plus, a 32auto is quite capable of doing the job. I always prefer my sig p220. But that's mainly because it's just a kick butt gun. But I feel confident with the 32acp.