I really hope for a Mario Maker 3, they didn't have much reason for it before but an entirely new 2D Mario game just might be that reason!

Both are really fun. Modding is a little more effort but a satisfying result, pre built handhelds do the job just fine and are usually cheaper and easier

To be fair, subredditsimulator was most likely never intended to do what you are thinking. As you develop features, you need a test data set to check it against before you go live with it. My understanding of subredditsimulator was that it was reddit's test bed to be able to try things before they get widely rolled out.