Not tried the DT but I’m a couple of years into owning a pair of Hope 20fives in 32/32h configuration.
I run them on my “road” bike with 38/40mm tyres and I’ve not had a single issue. I specifically didn’t want a wider rim as I wanted to be able to run narrower (than the current 38s) tyre.
I do have two minor gripes though …
1) as above they are more difficult to tape than other rims I have used.
2) the freehub body ( as with all alloy Hope freehubs) is starting to show some wear but nothing that isn”t easily dealt with using a file!
Above 40mm, and if you want them for gravel use then, I would look for a wider rim than the Hopes.