Truthsharer it’s not my place to teach so I’ll be silent, but your comments in regards to respected poskim – many banned corn – and entire movements in Orthodox Judaism (may I mention gebrochts?) and your attempt to make unlearned readers think respected poskim are R”L adding to the Torah and stating “it’s not how halacha works”, disturb me.
I am sure you realize that for generations, Pesach was a great sacrifice for people. Vegetables that don’t have a thick skin are very difficult to clean, if one is living in a hut. Milk and dairy require a pesachdig dairy pot, and many did not even have one. Koshering year-round pots was impossible. Even obviously permissible food, such as nuts, were not always available or affordable as produce availability greatly varied from year to year.
Our ancestors did not save on Yom Tov expenses but still could only afford what they could (and many things were not out there for sale, not for any money), they cleaned (can you imagine cleaning for Pesach without the modern detergents, without disposable cloths, without a faucet inside the home), they baked matza (can you imagine?) and yet, those who so were told, refrained from potatoes.
If you eat quinoa and corn, good for you and enjoy them on Pesach as well as year-round. If you are sefaradi and eat kitniyot, enjoy your KLP rice and beans (if you actually had to check it like sefaradim had to do until a few decades ago, it would become much less tasty). If you can’t fathom other people’s respect for their ancestors and if you can’t fathom other people’s feeling that rushing it (again, how long it took for a consensus on cocoa and coffee?) in order to cook a quinoa dish is unneeded, given that we already have all sort of products available for Pesach, we live in a modern house where eating vegetables is a hassle but for most vegetables is fully doable, we have KLP bottles of all sort of drinks (not just water) and a faucet whose water we don’t need to be afraid a piece of bread fell, or was thrown, into (differently from a well, if I may say), if you can’t fathom any of that, it seems to me the problem is not kitniyot and is not quinoa and it’s not chumrot either.
Finally, quinoa is a dull food and I wonder how many among us find it tasty and have a desire for it year-round. Sure, it’s definitely edible, I don’t mind it at all and sometimes I buy and cook, but it’s not something one would make an effort and sustain expense to acquire and cook for the king if the king came to dinner, is it. One is forced to wonder whether people are crazy about quinoa and have asked their Rabbi if it is permissible and have greatly rejoiced when told is it, or if people don’t really care for quinoa and are only eating it on Pesach to make a point.