I think the roguelike community is a tad burned by the vaporware syndrome.
Too many people came up with great ideas, shared them and discussed them, some even received praise for them only to disappear into thin air while the game never saw the light of day. There's also the case of one person posting several dozen game ideas, some of which quite generic and whenever a game came out that even remotely looked like one of his sketches, he went ballistic. Not saying you will, just mentioning that there were several similiar cases. I think that's why people generally frown upon themes, concepts and ideas unless they're fully realized.
I mean everybody has ideas, some of which are great. Heck, I think even I have a couple of at least interesting ones. But in the state they're now in, they're just text. Just concepts. Pointless, worthless and useless for anyone but myself. And even in my case they're mostly a vanity item so why should I bother others with it? Not to get you down. Keep pumping out ideas. It's a good exercise for yourself. Just don't expect people to celebrate or honor them. Also if you want comments on those themes, flesh them out a bit. Oneliners won't spawn lengthy comments. A well thought out longer concept might attract good feedback - if the moon doth shine and the planets do align.