I don't really see where he said that, but regardless, if there is one thing you should take away from this part of the discussion it's that HS is an extremely poor source of FPs.
No. That is NOT the one thing anyone should be taking away from this. I said it right here. Apparently, you didn't read past the first sentence.
Unless you're putting SoKs into storage to plant HS, this argument doesn't even make sense. I built HS in HMA. From the moment it reached level 3, it has been the sole source of Happy in my city and I pushed it to level 10 prior to building my Arc. Now that my Arc is at 80, I'm pushing it to level 20, along with the rest of my existing GBs.
I first built HS for the Happy. It allowed me to delete the same number if squares of culture buildings and I got extra FPs as a bonus. Now I level HS for the FPs and get extra happy as a bonus. With HS I've also not yet built Alcatraz, saving me a ton of extra squares. Conversely, I've yet to build Cape even though I've been able to for a long while.
I'll build Cape eventually, but right now, FP GBs that provide other benefits are far more attractive to me. Including HS.
Using HS for happiness is not a good idea. For one thing there are many buildings you can build that give happiness plus other important resources. But, much more important that this, if you move up in ages, your demand for happiness is going to increase but the amount of happiness you get from HS is going to stay the same.
HS has provided me all the happy I've needed in my city since hitting level 3. I also put out all the many buildings I have that give happy plus other important resources like Attack bonuses or even FPs, you know, Cherry Gardens, Carnival sets, Carousels, etc. Any time I've needed to make up any happiness deficit, HS has gotten a few more levels and each time, I've gotten a few more FPs every day.
Yes, my happy requirements will continue to increase as I age up. As they do, I'll continue to level up HS plus put out any other special buildings I acquire that provide happiness along with other important resources. Any extra happy needed can easily be made up adding a few more levels to HS which gives me a few more FPs every day.
I have no goods buildings, no residential, no barracks, and because I've built HS, no culture. I've not yet needed to build Traz for either units or happy, so I still have plenty of space in my city to add additional SoKs, SSWs, and any other special buildings as I acquire them to produce FPs. PLUS, I have HS producing 12 FPs a day on top of all that happiness, and that makes me very happy.
I can't imagine why you would build HS over cape.
Cape has a fine ROI when taken in isolation and looking at FPs alone, but that's not how I evaluate things for my city. HS has provided benefits beyond FPs since the moment I built it eliminating all culture only buildings and HS has never had more than one tile of road touching it. I've never NOT put out a FP producer as I've gotten it because I built HS and there wasn't room. So, there was never a reason NOT to build HS, which I was also able to do long before I was ever able to build Cape.
I've yet to build Cape because, so far, there's been better places to invest my FPs, such as getting an Arc to level 80. That's helped power HS up to level 20, which now gives me 12 FPs every day. So now my efficient happiness producer that used to give me bonus FPs has now turned the tide to become an efficient FP producer that also gives me bonus happiness. This makes me even happier I built it long, long, ago.
I'll build Cape eventually, after other more valuable FP producers are built and leveled like AO, Kraken, and HC. Like HS, I'm building them first for their other benefits and getting the FPs on the side. I'll continue leveling both HS and CdM for those other benefits too, before I build Cape.
Eventually Cape will win my FPs, but until then, that bird stays in the hanger.