Maybe the organizers were afraid that some Benelux riders would take 10 minutes on the peloton early on and remove all suspense. So they have one big uphill finish and that's it.
I believe it's hard to design routes for women's cycling because of the absurdly big differences in quality from the strongest riders to the next. If you give them routes like in the Tour de France this year, a van Vleuten kind of rider will attack from 100 kilometers out and leave us with an even more boring race. They need to find out why certain riders are so dominating - only then will the route design get interesting in women's cycling.
And how do you propose they find out why certain riders are so dominating without testing out a variety of terrains? Just because van Vleuten is dominant in the mountains doesn't mean that mountain stages can't be interesting if you have reason to follow other riders. Yes, the mountain stages have largely been Unipuerto, but there's also plenty going on in the battle for places, young riders emerging and so on.
Besides, there's only so many race days that Annemiek can do even if she was eight years younger, so there can be plenty of hilly and mountainous races that she isn't at. Just look at races like the Tour de l'Ardêche which have been offering multi-climb mountain stages for years.
One rider being the best at a type of parcours doesn't mean that that type of route should be stopped. There's a complete continuum between pan flat and Zomegnan-porn (besides, Lorena Wiebes tends to be pretty dominant in sprints when she enters, and the more races which are kept artificially close by boring parcours designs mean the more likelihood of major crashes impacting the race).
If we start neutering mountain stages to avoid van Vleuten dominating, then we just revert back to the worst days of the same old problem of every race being on the same flat-to-hilly terrain, and then the only type of riders that develop and become successful are the same type of riders as the ones that came before them, and no specialist climbers or cobbled hardwomen or rouleuses ever get developed because of the paucity of races suited to them, making them an unattractive investment for teams, and so the cycle continues. Besides, wouldn't watching Merckx go out and take 8 minutes when already in the yellow jersey have got pretty boring if we were watching it minute for minute back in the day? Or Coppi to Pinerolo? But these were epic stages revered for the ages, because we weren't watching four hours of the same guy turning pedals while the time gap grew bigger like we can today. Imagine what would have happened to the sport if they decided that Anquetil or Indurain dominating the ITTs meant they should simply stop having them.
We should look past van Vleuten, she may be dominant but she's also 39 years old. We should be looking at the breakout performances this year by specialist climbers who had long hit a ceiling because of their limitations on the typical parcours, like Pauliena Rooijakkers, as a good thing, the development as climbers of the likes of Juliette Labous and Évita Muzic, and the conversion of puncheuse types across to the high mountains over the last couple of years like Silvia Persico, Marta Cavalli and even Demi Vollering, as a good thing. That riders like Niamh Fisher-Black and Neve Bradbury become sought after commodities rather than afterthoughts given the increased variety in parcours. AVV won't be around forever, and besides, it's only this year that she's been completely unopposed because there was AVDB before - and La Course 2018 may have been a two-horse race at the end between two dominant riders, but what an advert for the sport with the tense last few kilometres showdown, attacks over the mountains and the victory stolen in the last few metres?