It will allow you to use a conductive crossboom, and/or route your feedline back out of the antennas along the crossboom. Antenna guru Kent Britain, wa5vjb studied and tested this. He wrote a paper on it and published it as part of an AMSAT symposium. You can see the paper here:

Using Metal Cross Booms w/ Satellite Antennas (kk0sd.net)

73,

Joe kk0sd

From: K4IDC via AMSAT-BB <amsat-bb@amsat.org>
Sent: Sunday, September 10, 2023 4:54 PM
To: AMSAT-BB <amsat-bb@amsat.org>
Subject: [AMSAT-BB] Cross Polarized Yagi: X or +

I'm new to this mode..

I was advised by someone I think is knowledgeable, and certainly more so than me, to orient my cross polarized 2m Yagi so that the elements resemble an X rather than a +. Easily enough done...what's the advantage? 

It's my understanding that the two sets of elements are out of phase by 90° & combined at the common feed point to emulate circular polarization. How does the rotation along the boom axis make a difference?

Seeking understanding...

Thanks,

Robin Midgett K4IDC