Same here, my go anywhere tires are usually 27 or 28mm, which means I can use my normal road bikes on all the roads & trails I usually ride, gravel included.
30+mm just feels slow even if it isn't, and this way I can use caliper brakes and enjoy a light bike
The Orbea looks nice, but gravel bikes are becoming the SUVs of the road bike world.
If you ride a gravel bike off-road, maybe even on rather rough terrain, i wonder if the lighest weight is prio one?
I imagine the stress on the frame is higher than that of pure tarmac.
Some seem to put gravel in same type of riding as a road bike.
But sure, if you ride fatter tires like 40mm they won't even feel as Schwalbes (ex) S-One tire.
I ran 7 different tires and the last was S-One. It felt like the bike almost would do a burn out compared to some other tires.
But when i finally hit the gravel, loose over hard and really crappy roads and trails, the 30mm tire felt harsh, bumpy and had not at all same grip and traction.
Finally, the fatter tires where actually faster on these types of terrain.
Fastest tire i have used which have better traction than you might think, is actually Hutchinson Black Mamba CX (34mm) tubeless.
Only tire i guess could be near this, is perhaps Panaracer Gravel King SK 35mm.
But i am not sure as i have not tested my pair yet. The Black Mambas works well on tarmac to.
To date, these are unquestionably the fastest gravel/cx tires i have tested.