Life expectency on full sakhal server is quite short unless you really stay hidden all the time because sakhal is small map, which makes it really not worth traveling back and forth tier3/4 and main island. I believe most players would enjoy the gameplay more if tier 3, shantar island and main island would all be connected via dense archipelagago and beautiful but tactical level design with cover and add whole lot of towns/industrial areas to shantar for base building for example. So that going to tier 3/tier 4 doesnt mean that you have to walk all the way back after that, i believe people would enjoy it much more if tier 3/4 area would be their graveyard as well, to save them from traveling back. Meaning make it a warzone and add loads more landmass in form of islands.

This happend on sakhal btw, server 1354