I personally use 2015 Macbook Pro 13" every day and love using macOS on it. If I could pick any laptop in the world, I would pick this one as it has the amazing trackpad and ports.
1) MacOS has bad support for software
It has support for everything I need. It has web browser, spotify and office suite. I don't really need to use anything else on my laptop. Everything is online nowadays.2) No Gaming or just few games
If I ever want to game I have a windows computer for that, though I rarely even want to play games anymore.3) Less piracy ( good for some and bad for other )
Software piracy is illegal so I have no interest in it.4) Poor performance ( if not hackintosh )
Performance is all about the hardware, my macbook pro is just as powerful as a windows ultrabook with the same hardware.5) No Nvidia support which means no CUDA/RTX for 3D/Video editing artists. ( if not hackintosh )
I don't even have a dedicated GPU so I cannot comment about this6) Outdated UI design / no customization ( everything literally looks identical to 2011 iPhone on 2018 MacOS or for example their Store icon looks like it was made by someone on Fiverr for 5$ )
I personally think that macOS GUI looks really nice, the trackpad gestures alone are miles ahead of anything on the Windows side and make all of the shortcomings of the platform worth it. And at least for me it has enough customization.