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Seriously, put that in the preferences... It used to annoy me in the past... but now with the hideous CS6 splash screens it's simply a necessity.
Its a pity…
You can bring this up for discussion here: https://feedback.photoshop.com/photoshop_family
Unfortunately can't say how long that will take if at all.
To disable the CC 2018 splash screen just add this switch to the target path of your Adobe CC shortcut
Ex : "C:\Program Files\Adobe\Adobe Photoshop CC 2018\Photoshop.exe" -NoSplash
Note there is a space before the switch but none within it.
AFAIK this has always worked for each new PS release.