I feel you. When creating an UI you can think of thousands of possibilities which might not be clear to someone and design it in a way that couldn't possibly be misunderstood, then show it to different people who all agree that it's clearly structured and logical..... and the minute you release it you get posts from users where you ask yourself how they could even exist on their own.
True, but there you don't have the problem that you can access subreddit "gamingB" but not "gamingA" because you happen to be logged in on an instance that defederated "gamingA".
Or when posting on "gamingB", not seeing comments from users of "gamingA".
You can just access all of the different subreddits with one account and freely choose on which on you'd like to post and always able to see every post ever made in every sub