In addition to a few road bikes, I have a Canyon Grail gravel bike with a 50/34. It's light for a gravel bike - around 18 pounds. And, I have a second set of narrower wheels with an 11-28 cassette and 28mm road tires.
It is "good" road bike, but not a great road bike. As Colnago Mixte pointed out, everything that makes it a great gravel bike, detracts from its road bike chops. It may only be noticeable because I ride both, but compared to the road bikes, the Grail really feels long - standing and hammering/sprinting it can feel like I'm on the front of a tandem (the dynamic, not really that exaggerated). BUT... if I had room for only one bike, it'd be a gravel or cx bike.
A CX bike with two sets of wheels and a compact crank may be a good balance - geometry more similar to a road bike, room for wider tires.