Hi cloudcover,
Every layer and component in a mattress (including the cover) will have some effect on every other layer and component both above and below it. A quilted cover will certainly have “some” effect on the “surface feel” of a mattress compared to a thinner more stretchy cover where you are sleeping more directly on a latex layer but different people will have have very different opinions about “how much” of an effect it would have or whether the effect of a quilted cover would be beneficial (which would be the case with many people) or detrimental (which would be the case with some people). There are probably more people that would like a the more “relaxed” surface feel of a quilted cover than the other way around but of course each person is unique.
There is more about the pros and cons of a quilted cover vs a more stretchy unquilted knit cover in post #12 here and the posts it links to.
The “bottom line” is that the only way to know for certain whether any mattress will be a good “match” for you in terms of firmness, feel or PPP (Posture and alignment, Pressure relief, and your own Personal preferences) will be based on your own personal experience (which may be different from other people) and of course this is the reason for the trial period and refund policy so you can try the mattress yourself in your bedroom instead of a showroom with little risk (outside of the time you spend sleeping on it and/or returning/donating it if it doesn’t work out as well as you hoped for) and base your assessment on your own first hand experience when you sleep on the mattress.
Phoenix