Of course you could just copy and paste patterns to get those parameters/kits into other patterns.
However, that is not the issue. Only being able to copy the kit via copy/paste of a pattern excuses the elegant functionality of kits;
Being able to edit sounds, no matter which pattern you are in, and having those parameter edits be applied to other patterns.
Otherwise it has the potential to become a major workflow issue.
Being able to move fluidly between kit editing and pattern (sequence, notation) editing is a cornerstone of the Elektron workflow.
Perhaps I am looking at DT too heavily through the lens of the highly flexible and elegant schemes of the existing Elektron instruments.
But I only blame Elektron for that, because Kits are bloody brilliant, and if they are now hamstringed for simplicity and can’t be linked to 2 patterns or more, then I question the design decision of form over function.
And somehow, with DTs and the manual all out in the wild, info regarding this concern continues to remain scarce.