ISI claim this is not the case, the game is not in Beta, so, they have to take care and be more accurate before delivery an update. I'm ok with the fact they continue to fix and improve things, but more serious is needed when you sold a product and not a beta.
I don't think ISI devs spend huge amount of time testing all setting with each build, because it will be time off from programming and they are a small team. They rely on community testing (internal tester forum and unstable forum), much like some open source projects. Sadly the unstable forum is almost useless, the internal forum which I am member of has way more activity.
I`m just wondering wether the tester have a checklist of tasks they have to do on each Build? If not, ISI should think about this...
It would make sense to model a "Test Scene" which included a series of objects/track parts using a wide range of materials and shaders - then testing this under various conditions would make it very easy to spot atleast graphical bugs. But I asume they don't...
