No, I'm happy to retreat to the familiar, and nginx is pretty familiar. After having my tail feathers burned with OLS, I doubt I'll switch to anything else for the next several years without an extremely compelling reason.
Sure I'm not suggesting it now as a follow up, I just wondered if it was something you were aware of and dismissed for some reason over the last several years before opting to try OLS (which I hadn't heard of) instead; especially since you mentioned Let's Encrypt.