I am on the other end of the spectrum. I like my cooked veggies done "al dente" unless they are in a soup or stew. I also eat many raw vegetables and have a big salad every day. I have no problem absorbing nutrients (as my ongoing battle with my weight shows). I have no deficiencies other than vitamin D, but that is not an absorption issue.
My pouch function is fine with this varied diet, but this is something that occurred gradually over the years.
But back to your question. Yes, pureeing or liquifying raw vegetables should make them easier to tolerate, if you are having problems. Just understand that if you are having specific intolerances (like someone may have to wheat or milk, but to a vegetable) pureeing that vegetable will not alter that response. Pureeing is mostly helpful if you have chronic obstructions.
Jan