Personality change following neutering

Apparently, my 15 month-old tom-cat Stinky has reverted to kittenhood
after castration. He plays with his sitster like he used to as a
kitten,
is much more fearful (of loud noises, people, etc), goes out much less
frequently and sleeps a lot more, and has stopped roaming at night.
The only good thing is that he no longer comes home with fighting
injuries. Still, it makes me feel very guilty.

Is Stinky's behavior change normal? Will he ever regain his confidence
and swagger?

EvelynVogtGamble(Divamanque)...

Unless he had an unrelated stressful experience at the
vet's, I can't believe the surgery would be responsible for
anything but less tendency to roam (a good thing) and fewer
incidents of inappropriate spraying (an even BETTER thing).
Are you COMPLAINING because he seems more playful?

Jo Firey...

Hard for me to answer.

He plays with his sister.
Goes out less frequently
Has stopped roaming at night.

You don't consider those good things?