The caps on presta valves aren't necessary as there's no way for dirt to get into the valve stem (unlike Schrader valves which can get clogged). The caps are useful for transporting the tube though to prevent the valve from puncturing anything.
Wheel reflectors are also pretty useless so you can remove those too. Plus you save some weight.
Wheel reflectors are also pretty useless so you can remove those too. Plus you save some weight.