Yes, huge honkin’ cables like the ones you are doing [CONGRATS on becoming a cabler! This is one of the proofs you are entering Expert Knitter territory] do have to have holes.
Let’s think about it. One half of your sts need to cross over the other half within 1 action. When you only have 2 sts crossing, the “hole” for those 2 sts needs to only handle… 2 sts. Not noticeable, right?
So now let’s do 7 sts crossing over 7 sts. Again these 7 sts need to cross all at once. Now the “hole” must be big enough to allow 7 sts to go through. Now you’re talking larger holes simply because they must handle 7 sts over 7 sts instead of 2 over 2.
Let’s consider the size of needle you’re using. A smaller needle, say size 3, gives you smaller sts. So the 7 over 7 would need a small, size-3 stitches hole to handle those 7 sts.
A larger needle size, say 11, gives you noticeably larger sts. So… yep, you’re right. 7 larger size-11 sts need larger size-11 hole to handle those cabled sts.
Does this make sense? Have I proven to you that your “holes” are normal and part of your overall pattern?
Hope this helps,