客= 苦格切 閩南白讀=kh+eh,文讀 kh+ik .hakka 白讀 h+ak,文讀 kh+iet. The hanzi 苦 and 格 in both have the exact sound of wen and bai.So h stop in teochew and minnan have theory from the 反切 in standard chinese.Fuzhou drop p,t,k and change to h .
I cannot see what is the point you ask about this.Minnan with h combine with others like ennh,annh,iannh,oonnh,etc will have more vowel.This will make minnan richer even for some strange sound effect.
Imagine that Wu languages are older than min languages but now they have only 50 vowel .Their p,t,k become h.
When we define any han language,we will look at how many yunmu it have .It will be any kind of vowel or along with consonant like p,t,k,h.
minnh =物 。 ninnh =躡﹐捏 .hannh4 暍 (This is the word where 哈韓﹐哈日 came from)
Wu also have much palatalization as Mandarin. (change of ki into ji-like sound). Wu also dropped the Rusheng -p -t -k ending into -q (glottal stop), dropped -m -n -ng into nasalization. Thus the number of the rimes decrease considerably.