I have made a dozen or so shirts, mostly from my home grown, home spun and home woven fabric.
I found putting plackets on the cuffs rather tedious so I switched to woven cuffs on the most recent ones. This is a simple expedient but not quite as neat as the placket style.
I am making one now and decided to go back to the placket. About the time I finished the plackets and got one sleeve sewn on, I happened to notice that the shirt I am wearing has no plackets at all. It's an LL Bean shirt that some one gave to me.
The slit is simply hemmed on both sides. A few pleats and the cuff and button finishes the job.
I see nothing objectionable about this very simple approach and spent the past hour searching the net for the purpose the placket serves and can find nothing other than that it is the fashion.
Surely there is a better reason for all the bother? Unless someone can provide a better reason, I think I will try it on my next shirt.
I am retired and not much concerned about fashion.