Good points. That’s why people like venerable @sujato highlight the importance of understanding mythical narratives and Buddhist mythology as just that, narratives, and knowing what to do with it.
And the more unique or original these narratives are the more likely they can be traced back to the Buddha himself.
And then, given the argument of faith in the founder of the spiritual community we decided to be part of, we should see what from those mythical narratives can be of help understanding our place in the world and the path.
For example, when it comes to the topic of other realms, devas etc. My takeaway is to suspend disbelief in these possible aspects of experience I may still be unaware of.
For whatever reason either the Buddha himself or the early community understood narratives involving these things as relevant.
And they made a massive effort in keeping these stories through time initially via oral transmission and eventually via textual transmission.
And they could have decided otherwise, the materialistic charvakas were already present and were the ones discarding all that in their view of the world.
In the case of the mythical narratives around cycles of the universe and / or likely future state of things (e.g the seven suns story), I am open to the idea that indeed as the Buddha attained to the three knowledges (tevijja) he may have gained some insight on how short /narrow can be the time window for complex and intelligent life to thrive in a planet like ours.
And, as a result, how it is that we make the right choices as individuals, communities and/or species to not spoil things when conditions are pretty much close the most optimal they can be in a good while.