Hugo
Jesus. I can’t even tell you how much time and effort I’ve spent keeping the same theme limping along for Hugo while Hugo continually progresses and advances in how it’s generating content. The theme I picked hasn’t changed a ton over time. I’ve had to address essentially every deprecation along the way using “_default” templates. I can’t even count how many I’ve had to do at this point, but I might as well just fork the damn theme and own it myself, since the original author isn’t really interested in keeping it up anymore.
We’re up to Hugo v0.133.0 at this point, and the deprecations probably started in earnest around v0.110 or so. I won’t say the original theme author hasn’t addressed any deprecations, but I will say that it’s never been timely and it’s always been far more convenient to just handle myself. Thankfully Hugo has easy facilities for overriding theme files, and the mechanism is kinda genius. Maybe that’s the next “info” post I should throw up; How to keep a near-dead horse of a theme limping along in Hugo.