@TJMcG I've had this same discussion with
@Ysarex before, and while both of you have valid points, it boils down to, does it really matter? In professional photography, time is money. Edits are completed using a workflow the photographer feels comfortable with, once completed, and delivered to the client, they're relegated to the archives where they're never seen again. While hobbyists may like to do "what ifs" on past edits, Professionals don't have the luxury of second guessing and reworking past edits for fun. Add to that the rapidly evolving technology of software, makes it sketchy on re-editing old images, especially highly processed images.
I'll concede the point on destructive editing, but point out that like Don Quixote, idealism vs realism are entirely different, as are end users of editing software. I no longer do any paid work, but even as a hobbyist I could count on one hand (and have 5 fingers left) the number of times I've felt the need to go back and edit a PSD file. If this "was" a major problem Adobe would not be at the top and one member wouldn't be the sole protagonist on the pages of TPF.
I appreciate it's not a big deal for you. That's your style and the editing workflow you've developed that you're comfortable with. It's not going to matter to the same degree for all of us. For me it's a very high priority. Enough so that I switched my processing software back in 2012/13 over specifically this issue. We're all going to be different. I didn't bring it up in this thread. I only responded on two occasions when it was brought up by others -- folks brought it up twice in this thread.
Another way to gauge how much it matters is to look at how the software vendors treat it in their advertising.
Does it show up in Adobe's, ON1's, Affinity's, ACDSee's, Luminar Neo's advertising to name a few? Yes it does.
Adobe has a view all features button on their PS opening page. That next page has 5 topics; What's New, Image Adjustments, Retouch, Add and Remove Objects, Paint and Draw. Looking under Image Adjustments Non-destructive editing is one of the six topics presented along with Upscale Images, Flawless Colors, Apply Filters, Swap the Sky and Modify Color and Tone. Not top of the list but it's there.
For Affinity Photo it's top of the list. They present a Full Features List page and under Image Editing and Retouch Tools the first item is; Live, Non-Destructive Editing (pretty important to be first).
For ON1 Photo Raw the 2nd sentence on the opening page: "This powerful software offers a complete set of advanced editing tools, including AI-powered features,
non-destructive editing, and precise color control." [my bold]
For ACDSee Gemstone the 3rd sentence on the opening page: "With AI-driven enhancements, infinite layered editing,
non-destructive RAW processing, and a dynamic multi-document interface (MDI), Gemstone propels your artistry beyond the expected. [my bold]
For Luminar Neo Scrolling down opening page -- big heading; Experience Luminar Neo's Capabilities -- 4th item mentioned: Non-destructive editing.
The software vendors think it's important enough to feature it in their advertising.
In addition to making revisiting and changing a previous edit easy/possible there are other benefits to a non-destructive parametric raw workflow. Most of my editing since I left Adobe back in 2012/13 has been done with Capture One. C1 is not the leader in noise processing by a long shot but back in 2022 they managed a major update to their noise processing algorithms and improved them substantially. All of my images immediately got updated because they're 100% non-destructive parametric edits. If all of my previous edits were PSD files none of them would have been updated.