At a population level, MS disease progression appears to have slowed in recent years. This study assessed whether earlier detection of people with potentially milder radiological disease is contributing to these observed trends in MS disease course. The time from MS symptom-onset to the initial brain MRI of the study population alongside the white matter lesion count and volume on this scan had not significantly changed over 17 years (2006 - 2023). The age-related MS Severity Score significantly decreased, and the MS Severity Score remained unchanged throughout the study period. These findings suggest that earlier detection of disease or lower radiological disease burden at presentation do not explain improved outcomes in MS.