There's not really many comparable towns in Kansas? Belleville got bypassed but that's more due to the routing having to curve there than due to it being routed through initially and then a bypass being built. Plenty of towns along the route in Nebraska aren't bypassed (and some of the route is only one lane each way; a much bigger issue for the whole corridor).
My first thought was actually, "I don't remember Concordia taking a lot of time to drive through, and I think there are only four stoplights."
And actually, a lot of those Nebraska near-bypasses nevertheless have speed zones, and my experience is that the police are very eager to catch speeders in those zones.
It's more the bridge on the north end of town. Heading north, it's one lane through the intersection at 6th. South has two lanes and a left turn. Once onto the bridge, it's 2 lanes each way. But narrow, no shoulders, and kinda steep from a dead stop. Especially for trucks.
And just that it's a bunch of lights. Belleville is kinda bypassed, just not as a freeway. But the fact the road stays a freeway long after I-135 ends at I-70, it is a bit of a shock. Then, you're back up to a rural four-lane expressway to York. And even with the lights and businesses around the I-80 area south of York, it keeps a bypass all the way past town.
And then US81 turns into a meandering, stunted road. Turning at NE92, going right into downtown Columbus. No real bypass there, though US30 to US81 has a bypass(?). And again, right through Norfolk. No bypass. After that, it's utility descends to a local route mostly, except long distance drivers shunning I-29 heading southeast to Kansas City and instead opting for the straight shot to places such as Wichita, Oklahoma City, etc.