PL259 s are
easy to terminate with a little practice and a good soldering
 gun! 
 ?...and then you have coax terminated with a crappy connector that's not
 waterproof, lossy, easily contaminated, and has a huge impedance bump. 
 
How much is the impedance mismatch, when the termination (or source)
is immediately next to the connector? Not much, in the real world.
Problems abound when using these anywhere in between.
--
Will