Some native soils are not very conducive for planting and growing roses to optimal conditions. That's because roses are thirsty plants whose roots prefer porous, nutrient-rich, moist but well-draining soil. An ideal, mature soil would be made up of approximately 45% minerals (a combination of sand, clay, and silt), about 5% organic matter (plant and animal), and roughly equal parts of air and water (about 25% each). It would be crumbly, relatively dark in color, smell earthy and rich, contain microorganisms and earthworms, have plenty of nutrients, and a pH between 6.5 and 7.5.
But many native soils are far from this ideal, because they may be predominantly clay-based on one extreme, or too sandy on the other. Heavy, thick clay soils are often greasy when wet, or hard as rock when completely dry. They lack aeration, and are slow to drain. On the other hand, sandy soils are so porous and well aerated that they are very fast to drain, and often dry out too quickly for many moisture-loving roses (with the possible exception of rugosas, which are also known informally as beach roses). There are also gravelly soils filled with scree, such as those in dry mountainous areas, which present their own challenges to growing roses (which
@RoseBlush1 can attest to).
This is why it's perfectly acceptable, and often necessary, to augment native soil with amendments such as compost, peat moss, leaf mold, etc. Note that the above "formula" for an ideal mature soil is only 5% organic material, but I add considerably more to that when mixing my own soils for a new planting, because compost will continue to decompose over time.
One of the best courses I ever took at the New York Botanical Garden many years ago was on the topic of soil science, how to identify the type of soil you have, and how to amend it to bring it closer to a loamy ideal. Short of taking such a course or having soil professionally tested, there are plenty of resources online that will quickly help a gardener understand what type of soil they have, such as these
https://ucanr.edu/sites/MarinM...
https://www.thespruce.com/maki...
The first link is a bit more academic, while the second link is a bit more casual in its explanation. There are many other resources that can be found on numerous horticultural websites.