Some people like being able to spot their own shot impact... whether its on steel or rocks, or just getting a good view of the red-mist effect when shooting varmints

Otherwise... some people are more recoil sensitive than others - I know I don't like shooting most 'hunting' rifles in deer/elk calibers because they don't fit me very well, combined with the light weight, which makes them seem to want to jump up and bite when I pull the trigger...

And then there are rounds like the .338LM, which ain't too bad to fire with a brake on... but without a brake, well that just ain't a whole lot of fun :'(