Regular infantry can get more stopping power from silenced firearm than a crossbow. Because of that giving them crossbow makes no sense other than for teh lulz and $med Cash(in case you wondered what SC means). However, giving crossbows to MAXes could be a cool little feature. They could transfer kinetic energy from exosuit to crossbow to propel a deadly projectile. Crossbows could work as long range AI weapons. Devs could even add crossbow arrow with thermite head which could be used as a MAX anti-vehicle weapon. Discuss
Zero feasibility at the setting's current tech-level. If you want to fire magnetic coil accelerated spikes out of a gun though, be my guest.