For me its about fun. And these class-combos arent fun to me.
The Marksman-Veteran one I especially hate because its basically zero effort. Sadly I know a few people who basically can’t get by without this.
At least with the Tactician-Demolitions one, requires a bit more work for the Tactician (and I’ve seen some people struggle with getting meatshield successfuly without dying!) But even so, I’m not a fan of this at all.