Why so salty? His game will probably have a fraction of the resource requirements of the overkill, overbloated, kitchen-sink engines written in C# and C++. I would command this author for not going the easy way. This takes skills.
Because most folks on social media that suggest replacing engine X with Y, mostly reveal a complete lack of knowledge of what engine X's capabilities, market presence and synergies, or why studios pick it in first place.
You'd be surprised to find most studios pick X over Y because it's either familiar to their devs or cheaper. Better doesn't really play into it and a thorough evaluation beforehand isn't usually done.
