I'm no tech savvy either, Yiannis. I just wrote what I know.
Unity as a platform has nothing wrong in it. My guess is that the original developers who created the very first WGT back in 2006 are all gone, and now the new guys in the house just aren't competent enough to recreate it over the mobile platform. I'm really sorry to say this WGT but you guys make it even worse, adding more bugs and glitches after every single update.
To be honest, I think WGT cares about their game quality no longer. As a simple and straightforward example, have you noticed the poor quality of graphics nowadays? Take a look!
At first, they cared about even little details well enough to make the ball on tee look pretty realistic but now? They simply copy and paste the image of ball behind the tee. Sorry once again WGT, even I can do a better job than that! IMO this proves the company doesn't care any more... which is very sad.
Making money is important, going into the black is important, marketing is important. But remember! You guys are a gaming company. The quality of game matters the utmost! Go back to basics, the rest will follow!