For the many years that deployments have been done, I've yet to see one be completely ruined or shafted by not having setspawns.
Even when I had the ability to set spawns, it never occurred to me to use it, not for lack of creativity (I dare you to challenge mine) but because there was never a practical reason to have checkpoints/custom initial spawns.
Also lag from tacs is minimal on ES. Hell, you can spam 25 hunter-choppers on ES before feeling any lag, Tacs do not contribute, they're low-poly few-lines of code with an NPC (Yes, the hologram is coded as an NPC stuck in a pose). 25 tacs is the same as 25 miniature NPCs with no AI and 25 props. If that causes lag, then we better remove SOBDE because their dupe is 10x that on MAIN SERVER