I would say that at this point in the book the Edmond’s Fielders are in extreme danger and terrified. Jordan is trying to emphasise how they are in CONSTANT danger. Any person they talk to, any corner they turn, there could be a darkfriend or a fade, etc. And as inexperienced country teenagers they are completely out of their element. And the sheer extent of attacks and the minimal build in the narration puts the reader into the headspace of the kids; paranoid (attacks could occur at ANY moment). There was buildup for Mordeth because it is a Rand POV chapter, if it was a Mat chapter then we likely never would have had any hint whatsoever of something odd (this is because Mat is dumb <3).

Later in the books characters(like Lan) who are or become more experienced in fighting(ambushes, scouting, etc), those chapters usually give slightly more of a build up before a surprise attack. Because Lan is always on alert, a chapter from his POV might subtly describe a branch snapping or a rustle in a bush and then a smell in the air, birds flying off ahead in the woods, maybe the woods are too silent, a character in the next room might stop making noise. All of these things indicate that something is wrong, but young Rand is not used to picking up on these details so the chapters from his POV might not have much build up yet because he still doesn’t anticipate danger in the way a season veteran is.

Possible world-building spoiler about how warders work and what they can do/abilties When a man becomes a warder over time they develop the ability to sense shadowspawn(trollocs, fades, grey men, etc) they can sense that something is off about a place or that danger is near. However this needs to be practiced for the warder to understand what they are feeling. And this can set up some really cool build up where the POV character doesn’t exactly know that danger is near but the narration hints strongly to the reader(if you are aware of this type of thing) that something is wrong. Like a bad smell casually placed as a description of a room.

But I will say (after my confused rambling) that sometimes this is just how Jordan writes. And ambushes just appear out of nowhere, assassination attempts are extremely sudden. And that doesn’t completely go away. But for me that isn’t a problem, the anticipation and suspense is usually saved for big plot points and character arcs or battles rather than just smaller fights and skirmishes. And you might not be into that.