Buddha searched for the truth about suffering. What he found was the truth about the wheel of life and death.
Dukkha did not originally mean suffering, it meant : not running smoothly.
The process of perceiving, understanding and relating to life is not running smoothly, because pleasurable things lead to personal preferences.
Preferences are pre-references, and guide us to
always wanting to repeat or avoid past experiences; wanting to be somewhere else than here and now.
Perhaps Buddha taught us that the way to get the wheel of life running smoothly is to be guided by what is noble and true.