The reasoning behind purchasing an expensive GPU is it's the single biggest performance upgrade for an overall improvement to your system. I can say with my 2012 PC by purchasing a 1660 Super I can now play all the new games. I'm also using a molex to 6pin coverter on the original PSU and it works great. The worst I could see happening is the overload protection trips or the power supply dies. For me I already know my systems old so I'm not trying to push the limits of 8 year old hardware. It's just enough to keep me going. And over time I can save up for a new CPU and Motherboard etc while still being able to game. If someone wants to overclock. I'm sure they already know enough to make an informed decision. And they're already going outside of what the video mentions
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Absolutely. A GPU is what turns an Optiplex (or even an older PC in general) into a gaming PC. Without my RX 480, I certainly wouldn't be able to play all the newest titles as well. Luckily, newer GPUs do tend to be more power efficient, but it's best to just use a better ATX PSU as you can get them for fairly cheap and it not be total junk. A good ATX PSU with dedicated 6-pin/8-pin connectors will always be a better idea than using adapters. Other than budget, I can't think of a single reason why anyone would choose adapters over just getting a better PSU.