Hello shankar S,
This is very good feedback. I will recommend you use the feedback portal to post this as a recommendationhttps://feedbackportal.microsoft.com/feedback/
However, the global admin can recreate/elevate his permissions to owner. So it is not especially required hence why. See: https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/add-change-subscription-administrator?source=recommendations
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola