Fu. Svedberg said:
Actually not.
Bolts only you don't have to worry the least about any SMGs when storming into a room, you also don't have to worry about any MGs when passing an alley or door.
You can sit in a room or cap point and only worry about cover in line of sight you don't have to worry at all about also being in cover for eventual nades.
If you are skilled with rifles you can survive and help your team in games where all weapons are present. On a normal server your opponents use all weapon, this means you have to atleast consider all scenarios. On a server with bolts only you only have to think about the rifle aspect of the game (both on your own team and on opposing team).
Simpler scenario requires less skill since you don't have to consider as many aspects of the game while playing.