If you don't have good numbers in perception and initiative, you're easily ambushed and killed. Training and skill focus and a reasonable attribute modifier put a character at roughly +12. Without training or focus, that character would be at a +2.
Now imagine starting each combat rolling at +2 vs someone rolling at +12. Basically, you have a very high chance of be shot at multiple times while flat-footed. That potentially means you are starting every single combat with damage by the time you get to act for the first time. That isn't a good place to be.
On the flip side, you can easily build a small droid with a level of scoundrel and essentially wander around with a +24 bonus to stealth rolls... at first level. The odds of being spotted and attacked before you act are very, very small.
Now imagine starting each combat rolling at +2 vs someone rolling at +12. Basically, you have a very high chance of be shot at multiple times while flat-footed. That potentially means you are starting every single combat with damage by the time you get to act for the first time. That isn't a good place to be.
On the flip side, you can easily build a small droid with a level of scoundrel and essentially wander around with a +24 bonus to stealth rolls... at first level. The odds of being spotted and attacked before you act are very, very small.