السلام عليكم ورحمة الله وبركاته احسن الله اليكم شيخنا Mics weren't available at the Prophet's time ﷺ but conveying to people was needed and evidence is when people looked at Abu Bakr even though the Prophet ﷺ was Imam. So it isn't a maslah mursala because he ﷺ did it only with different means,right?

Ustadh AbdulAziz al-Haqqan

As we have mentioned during our classes, all masalih almursalah are allowed in Islam and what is of benefit is encouraged in Islam. This is totally different than making additions to the religion itself which is an innovation.