There's the LoS, we can't see beyond it so we do see things from our char's point of view. Somehow we just see behind us.
You're LoS is less behind you, it can and will be used by thieves, sneak bursters, etc.
That's to prevent players from mastering everything. Dice rolls are okay if there are ways to affect them via situational ingame decisions. Reduce your enemy's chances and raise your own. Stealing has basically no ways to affect the dice roll's outcome via ingame decisions.
Most in-game none combat related skills have a dice roll you can't influence.
Even the ones you can, like critical hits, have a dice roll.
Sometimes when leveling my lockpicker alt I have 1 critical hit after another on molerats. 1 hour later I can hardly get a critical hit on molerats while still using the same alt.
Except when using pickpocket perk.
I tried stealing from the front on an npc and failed more often than stealing from behind.
After I got pickpocket skill.
Major difference I noticed in that skill is that it became easier to steal large and heavy objects.
A win in fonline terms means lost equipment. Because thieves doubtfully steal while wearing CA and carrying 10k caps their losses are quaranteed to be minimal, but the victim's losses can be very high. If the victim is forced to move, it's either draw or victory to the thief if his plan was just to harass. Thief cannot really lose unless he starts to carry expensive stuff with him.
People aren't exactly running around with 10k caps and CA in their inventory either.
As for harassing, once again, you don't need a high steal skill for that.
Every one of my none thief alts can use it to harass people.
Or just use repair, lockpick, etc. instead.
His reputation works as proof. The report feature would work so that you simply cannot stage players.
That makes no sense. Reputation can also be bad due to shop shooting or bursting protected people or something as simple as standing in a door opening too long.
He can try to draw my attention all he likes but if I know he's a thief no tricks can save him.
Which goes back to the isometric view. You don't know he's a thief unless he failed stealing from you.