Someday I'll throw stuff out there eventually. Given my level of fitness experience and training I'm not entirely comfortable with suggesting anything to anyone just yet. Besides, to date, my best training progress has always been attained through following an expert's program.
Where this fails, however, is regarding bodyweight calisthenics and similar gymless options. There are few programs in this area that are written and cookie-cutter, incomplete or based too much on either strength or endurance with little regard to muscular hypertrophy. Then there's always the problem of building a satisfying yoke with bodyweight calisthenics, which is why if nothing else I'll usually fall back on deadlifts, shrugs and the like.
If my wife is able to make gains on her program like I have with my own cookie-cutter setups, I'll have a better idea of how to put these types of things together. I know what I have done and what has helped me, but actually helping someone who isn't myself is whole new ground. It needs to be addressed properly or not at all; although I wasn't always like this I stay silent on issues of which I'm not knowledgeable. Or refer to an expert's advice. Or at the very least admit my doubt! This needs to be addressed better in the OP, too, my section definitely included. Like, what should we suggest to someone who has a barbell set but no squat rack? What about someone with dumbbells and a pull-up bar? Someone stuck in a hotel room most of the year? All of those are valid scenarios and if the standardized response of "get a gym membership" isn't a option it would be helpful if the next option was already laid out in the OP. There are correct answers in this regard, or at least some more correct than others.