Comparatively there are very few people having problems, compared to the total number of users. This is not to say there isn't a problem. But any time you try to improve software there is going to be problems.
There are literally millions of different computer configurations out there using different operating systems, cpu, graphic cards, drivers, antivirus, firewalls, etc. So it is impossible to foresee every possible problem.
As far as why not leave it alone. Every thing can be improved upon. And if we as man kind had used that theory as if it is not broke leave it alone. We would still be living in caves but then again if we did not try to improve things this discussion would have never taken place. We would still be dragging women across the cave by there hair.
Any way as another user says it is just a roller coaster ride, So just hang on and try not to fall off they will get it right eventually.But I hope they never leave it alone.

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A little common sense goes a long way

Later Grandpa