Happily, there are different types of spoilers in Discourse, so lots to play with. Maybe one type of spoiler, say blur, for one thing and maybe hide details, for another. (click the gear thingy at the top of the post box)
If you feel strongly about it, maybe you can add it to the thread in site feedback for creating a better theme, One Theme To Rule Them All
[Whoa, that was so cool! All I had to do was copy the link of the other thread after the comma, and the rest was done for me. This is going to save me tons of time posting here. I’m liking it.]