As written, the question is definitely opinion-based, but I think the question is easily editable to be on-topic, and I have tried to do so.
First, let me address this statement:
By preemptively closing this question, we eliminate the risk of arguments and overall discussion in the comments.
Both martial arts and the Internet are places that people will almost always disagree in some way. This is expected. Martial arts is also not like mathematics where statements are universally verifiable boolean propositions.
The point of the question and answer design is that commonly asked questions are searchable with answers that are helpful to future users. Framing questions to be useful to others is key. "Why would someone choose one over the other?" is more informative for future users than "What would you choose?".
This criteria will be different from person to person, so any answers given on this question would most likely state a personal preference or opinion.
This is an unreasonable criterion to close a question. Let's take some of your questions:
Is it necessary to practice falling on concrete to help prepare for a real life situation?
Here the are basically two viewpoints: falling on mats is sufficient, or not. But it's not the opinion itself that is useful, it's the explanation that will be helpful to future readers. It's good and healthy to disagree about the answers to questions like this. [Thanks for asking it!]
Is it okay to get a custom belt if you're not a black belt?
This is a question about etiquette, which basically means that the answer is solely based on people's opinions. If you did not care about what your social group would think about haing a custom belt, there would be no reason to ask this question.
I am also willing to be overridden on this. I don't think this is a great question and it is only marginally on topic, so if you think it should still be closed, then vote to close.