With house rules questions, just like any other questions, the trick is to be at least somewhat focused and have a clear problem you are trying to solve (besides "I am curious and want house rules"). Also, such questions need to really stress Good Subjective, Bad Subjective so they're not just untested ideas, which are usually very little signal to the noise. And of course shows understanding of the rules at hand already (a house rules question when there's simply a real rules answer the OP doesn't know will get closed).
The linked question ticks both of these boxes. The poster is clearly wanting, after some research into the related rules, a playtested rule for fighting while holding one's breath. That's specific (not "cool new blast spells") and stresses real play experience. It is somewhat lacking in not clearly specifying what a best answer would look like, but it's at least decently implicit ("a rule that more realistically simulates diminished capacity from holding breath while exerting yourself"). To be better it would say more clearly that it's looking for - diminished fighting, or more limited breath-holding, or what exactly he feels like the effect is he'd like to simulate.
Here's some really good ones (good questions, good answers):
In general, like the old game-rec questions, I would actually shy away from asking "give me a house rule" and instead ask about your problem, perhaps showing you understand the area in question and saying you're open to playtested house rules. Then answers can be a playtested house rule, or they can be something else you haven't thought of. "I want a more realistic treatment of degraded ability to hold your breath while fighting." Maybe there's some existing rule or set of rules, maybe there's a playtested house rule, maybe there's just a GM technique...
Sadly in general we should downvote/delete answers that don't follow GS/BS, but very rarely a question may get closed simply because the community just can't get it into their heads they shouldn't be posting random ideas - it's unfortunate and it's not the OP's fault, but in the end if we need to intervene multiple times a day every day on some question we're likely to just cut bait on it. So definitely remind people of GS/BS when you post these to help keep your question from that fate.
This sometimes works the other way. Like this is a terrible question by these standards, but it's saved by people answering it in a better way: Hobgoblin as a player character - but effectively if a question can really only be answered with frame challenges it's not a very good question. That one could have just gotten closed without comment, and probably would today.
Of course that line is arguable. This question: Looking for an alternative to my DM's favorite fumble table is mostly answered by frame challenges "fumbles are the devil", which to me makes it hitting the line for close-because-people-can't-keep-it-in-their-pants, but clearly those answering feel that it's in the "we're saving this bad question with a frame challenge" land.