True. I haven't used any program for image editing other than GIMP since 1996 (which I first installed on a GNU/Linux system running on a Sun Sparcstation 20!)
> I am in fact aware of no non-Adobe program that will read and write a Photoshop file with editable text layers (including Gimp).
That's just a consequence of being so incredibly standard.
It's only a 'standard' for those closed-minded industrial drones who won't ever contemplate using something different. This is the attitude that causes awesome, innovative software to disappear beneath a morass of "But it's not industry standard!".
I create graphics. I don't use any Adobe software. Adobe isn't the only graphics software company out there.
And someone whose employability is probably tied to a specific OS, toolchain or software stack really shouldn't throw stones.
The Adobe PSD file format is documented in painful detail here https://www.adobe.com/devnet-apps/photoshop/fileformatashtml...
The format is binary and extremely convoluted, in part because it attempts to maintain compatibility with 20 years of versions of Photoshop. Because of this complexity, I am unaware of any program that can read or write a PSD file that supports all features of Photoshop. I am in fact aware of no non-Adobe program that will read and write a Photoshop file with editable text layers (including Gimp).