In interval we can select the one we want. Also, it's easier to set for "Automatically adjust" to see them following the scale of the map use.
Unfortunately, by default, too many divisions are showing.
My idea is to, in options, have a way to define the number of divisions by layout dimensions like one each two in or something like that. So for a 10 in map, we could see 5 divisions in the graticules.
This could save time because the default is too dense for maps representation.
An alternative could be to define the way we want the representation and then, click « Automatically adjust » for leaving the same look at all scales.