Wouldnt pars plana vitrectomy reduce the risk of retinal tears or detachments due to vitreoretinal traction for someone with lattice and vitr degen?

Yes, but invasive. Your risk of tears or detachment is very low unless you are having flashes and have an enlarging area of lattice containing holes. The usual treatment in this case is laser not vitrectomy as vitrectomy itself carries risk of infection.