Why is the SAMBA daemon on the My Cloud a release client and not a full release?

My Cloud OS 3 Personal & Network Attached Storage My Cloud
1

While examining another issue I discovered this . . .

My Book Live Duo = Samba 3.6.5
My Cloud = Samba 4.0.0rc5
My Cloud DL4100 = Samba 4.0.9

Why can’t all WD NAS’s have the same release of the Samba daemon?

2

My Book - Too old for upgrade/update
My Cloud - Custom patches from Mindspeed (For CPU performance + enabled 64k page memory patch)
My Clod DL4100 - Another CPU, so no need custom patches. Latest Samba inside (No need for upgrade or possible upgade from Debian repository)

3

My Cloud - Custom patches from Mindspeed (For CPU performance + enabled 64k page memory patch)

So I should discontinue my search for upgrading smb?

WDMyCloud:~# uname -a
Linux WDMyCloud 3.2.26 #1 SMP Tue Jun 17 15:53:22 PDT 2014 wd-2.2-rel armv7l GNU/Linux

I’m looking because I often get 100% CPU on one core, for days on end, and it is the smbd process that is chewing things up ;- )

Thanks for any feed back
(Will change my search target for postings about 100% CPU, instead of upgrading smbd).

N.M.