True for human buildables since their main base will be extremely weak. It often consists of just a repeater for energy weapon reloads and a ret and/or a medipad.
I totally disagree with the alien forwards though. The aliens' regeneration and huge capacity of roaming around the map makes base defense negligible (especially since alien players are the defenses 95% of the time, and also because aliens will pressure all entrances of human's base, very often), and sacrificing a trapper or two is often not big a deal. Having one egg forward instead of your base adds to the survivability rate of a sudden luci/psaw/grenade rush. There will also be only one forward booster (that means, none in base) to allow aliens to regenerate faster and constantly have poison. It adds a lot of pressure to humans since a lot more aliens will constantly be in either the H base or the booster right in front of it, regenerating. The extra one or two trappers tend to make it extremely hard to chase and take down running aliens, on top of securing the forward and making it even harder to take out.
TL;DR: Insane pressure on one side of the map, slightly lowered base defense potential, added survivability because of egg spread, increased survivability and killing potential of aliens running out of human's base, more evoes, more rushes.
The result of all of these combined is far from being negligible if played right. The problem is there is no versatility in forward bases. (1/2 trappers, 1 booster, 1 egg all year)
Forgot to mention that since the forward egg is often the last egg built, aliens will automatically respawn there if it is available, adding to the pressure.