Hi nerwin.
As a full time working wedding photographer in based in Germany i can tell you Eric Kim is correct with this statement, that less is more. I didnt read the article myself, but i can tell you my opinion on that.
Working with 2 lenses and 2 cameras is what i do too. I take a full frame DSLR and a 35mm 1.4 for photojournalism and a 50mm 1.4 for group shots, portraits and detail shots. I take a third camera with me, but its the same as 55mm f1.2. Its a Phase One 645 with 80mm 1.9 lens.
So, why are we doing this?
The answere is pretty obvious. My clients know what to expect from me and work. If they hire me because of my portfolio they know exactly what images they will have at the end of the day. Detail Shots, Portraits, photojournalistic reportage... I charge a lot and i dont do experiments. Im a professional.
High paying clients dont want someone who is doing something with different lenses and get some pictures. High paying clients want a professional photographer who can guarantee his style of pictures. They want results they can rely on at the end of the day. Something they can be sure to get. Pictures they know they will have in the style they want. Thats why they book me and they why they book Eric Kim with a lot of money.
Less is more. Get a style and get some Business guidelines for yourself and for your customers. If they know what they get and you can guarantee constistent results, you get more "better" clients.
Best regards, my friend.