I can certainly identify with Toedtoes' statement about you choosing the various design feature of your own garden.
Obviously it's advisable to take into consideration, both the physical requirements of the plants you choose to use and the appropriateness, for them, of your growing conditions. However, for so much else it is a matter of personal choice. I'd say most obviously with flower colour.
Consequently, I deeply resent influential people of (historical and current) garden design imposing their own flower colour schemes on gardeners who choose/chose to consume their advice. For me, an obvious example is the immensely influential Edwardian British Gertrude Jekyell who wrote that "malignant magenta" should never appear in any garden at all.
Personally, I love magenta (whatever purplish red one takes it to be).
Below in our garden, livening up the yellows with magenta:
Livening up other tall phlox with magenta: