The whole 2008 station siting report is available here
; Myricks is discussed in Part 1. There wasn't enough land available either at the junction or to the northwest, and there's hardly any residential density due to the swamps. East Taunton will better serve both 24 and 140, and has plenty of room for a parking sink; in the event that shuttle trains are used to increase frequency on the branches, East Taunton will have an island platform for easy transfers.
For a variety of reasons, station spacing today is much higher than it was a century ago. There were 4 intermediate stations between Middleborough and Cotley Junction, 4 between Myricks and Fall River, and 6 between Myricks and New Bedford. Many of those stations served very small villages, and likely were more used for freight than passengers. They wouldn't attract the passenger traffic to justify the cost - or the extra running time for other passengers - for modern service.