Long story short it is unacceptable.
Why can t you use pex for tub spout drop.
With a built in diverter you could use a pex drop eared ninety degree female adapter and a nipple but that is more trouble than it is worth.
Why can t you use pex for a tub spout.
2 reasons i learned.
I m certain they do not want you to use pex from the drop ear to the tub spot but you could probably use it between the faucet and drop ear.
How did this project turn out.
In areas that are concealed like under a kitchen sink or vanity cabinet you can eliminate a joint by running pex supply directly to the shutoff valve.
Copper is the only professional installation material.
Also a lot of tub spouts have installation methods that only work with copper stub outs.
You can connect a compression type shutoff valve to the one half inch copper stub out and then connect your fixture.
A lot of manufacturers are very specific about this and i ve seen it hundreds of times.
Original poster 4 points 3 years ago.
Use a drop ear bend support to hold the tubing in a tight bend right.