There are only two cons that I can think of when considering using the Sony a7iii for real estate photography, and the second one is a bit of a stretch:

1. Menu functions are not very intuitive
2. It’s not ideal for higher-end commercial photography

Menu Functions

The most common complaint that I hear about the Sony a7iii, and Sony cameras in general really, is that the menu functions are not intuitive and somewhat difficult to learn.

I consider this to be a con because adding in difficult to learn menu functions for a beginner real estate photographer can be extremely overwhelming. It’s already hard enough to grasp all the other aspects of real estate photography.

The difficulty level of what it takes to consider composition, lighting, settings, staging, and all the other little things that come with creating a great photo is massively amplified if you are having problems figuring out simple menu functions.

This could lead to someone that is brand new to photography quitting all together. With all that being said though, I’ve watched photographers use this cameras menu without any issues plenty of times.

This is one of those things where if you just stick with it and stay confident that with practice it’ll become second nature, you’ll end up not having an issue at all.

Higher End Commercial Photography

This one is a bit of a stretch, but it’s still something that you should consider. The Sony a7iii has 24 megapixels which is perfect for real estate photography. However, photographing commercial architecture will benefit from having more.

This is not to say that you can’t photograph higher-end real estate or commercial architecture with the Sony a7iii or any camera with 24 megapixels. You definitely can and you will be able to get some good shots no doubt.

However, large scale photography can be very labor intensive on the editing end, so the more pixels you have the work with, the better. If you plan to get into architectural photography, you might eventually want a camera more like the Sony a7R IV.