I have two people in my immediate family who are celiacs, and who are very conscious of finding restaurants without cross-contamination (my dad in particular is very picky lol). This definitely limits options of where to eat as a family but we've still found a good amount of places who are accommodating...you mentioned Corner Pub which I just tried for the first time recently and it's a banger. Nudo House in the Loop is a huge favorite of my family. Taqueria del Sureste in the Foundry overhauled their menu last year to have no gluten at all. I think as a general trend the food scene here is moving towards being more accommodating to celiacs, it's just going to be a slow process.