It's time for a little story time. Once upon a time, I went to a photography meetup to try my hand at taking photos of people. At the time, it seemed like a great way to meet some like minded peeps as well as get some photos of "models".
When I first got there, it was a bit nerve racking to try to talk to all of these photographers who were already within their groups talking among each other. I came with a friend and talked with him for a bit until I finally got the courage to strike up some conversations. At the time I had no idea where I wanted to go with my photography. It was at that point where I wanted to take photographs of EVERYTHING. It's the really fun and experimental stage that every photographer experiences in the beginning. So I was pretty raw at the time. When I finally began talking to them, they noticed how much of a beginner I was. And I was okay with that. I wanted critique or tips. But the one thing I wasn't prepared for..... was the absolute bashing of the camera system I use. Once some of the photographers got to the point in conversation where they ask me what I was shooting with, they would laugh. They'd say something along the lines of: "Micro-Four thirds huh? That thing has such a tiny sensor! You are gonna wanna upgrade at one point." It was honestly really baffling. I felt bad and embarrassed of my camera system. It had honestly really rattled me.
Once all of the conversations had ended and the actual shooting began, I kind of just forgot about everything that was said and just began taking photos of the model. Now if you haven't been to one of these, it's pretty wild. Imagine a single model posing and 10+ photographers sticking their lens at the model and snapping frantically. I did my best to get photos that tailored to my style and just minded my own business. It was a good 2 hours or so of shooting and then the event was over.
The next couple of days, you'd see on the message board for the event the photos snapped from photographers and I was mortified. Some of the photos were absolutely smeared with terrible post-production or were just flat out underexposed(too dark) or overexposed(too bright). I would then notice some of the same photographers that told me about needing to upgrade my system to a system like theirs (i.e fullframe, crop, etc) being guilty of distasteful editing, composition, etc. I wasn't the greatest photographer at the time but I did understand the basics and could tell that some of the photos just looked off. I even talked to my friend about the photos to get some validation. These are the photos that I came away with. They aren't the greatest but at least they are properly exposed and edited cleanly.
Thinking back on that event today, I'd say this. Take photos with whatever camera works for you. I would never shame some one for taking photos with a particular system. If it allows them to create photographs they are proud of, then so be it. Also, having a big fancy full frame camera isn't going to automatically take jaw dropping photos. The photographer behind the camera will.
I take photos with an Olympus EM-10 mki and an Olympus 12-40 2.8 lens. It's a combo that has allowed me to take my photography to the absolute limits. I know my camera like the back of my hand. The body is tattered now, with the eye piece completely torn off and thumb rest destroyed...but I still love it. The camera is an extension of myself and it allows me to do the most important thing when taking photos. It allows me to not be conscious of the camera when I'm taking photos.
There is a ton of cross system wars that goes on in online message boards and what not. I stray away from them because think of this: They are at home typing away about how their system is superior while the folks who enjoy their system are outside actually making photos.