In the home, I use a kitchen knife for most tasks except opening letters. I suspect that most of what most of us actually DO with a knife might be done as well or better with a kitchen knife as any knife. This is certainly true in my case.
However, kitchen knives are often less portable than folding knives and present some legal carry problems in my state, so I use a folding knives for out-of-the-home food prep and utility.
Because it's the current fashion to paint useful knives black or olive drab and call them "tactical," I find myself owning a "tactical" letter opener and a "tactical" picnic knife, so I see nothing wrong with a "tactical" kitchen knife.