If the main supporting argument for this feature request is merely to remember what we previously had, why not do it with our own local documentation methods, resources and time?
IMHO, folks need to be responsible for their own historical documentation. This responsibility for maintaining long-term system build history shouldn't fall on TPU as far as I'm concerned, that sets an inappropriate expectation for a freely accessible community.
Not only that, having more direct control of your data should be brought into consideration here, if its shared, if it is public or not, where it is stored, etc. It doesn't matter if you maintain it in your controlled environment versus TPU's databases, there is an inherent risk. Sometimes things happen with upgrades or corruption, data has been lost before that wasn't restorable. Data could be lost again...if the expectation is set that TPU maintains historical system specs for folks that can't remember, and that part of the database gets corrupted or wiped out that can't be restored for any given reason now there's a problem. If you delete it or lose it, it is your problem. That's how it should be.
My solution to this problem is by maintaining a spreadsheet over the years where each page is dedicated to build, build notes, OC info, upgrades, pictures, etc. Keeps it simple to add a new build at any time, I even have a template page that I duplicate to speed up the process. Overall I'd say that method has been extremely easy to accomplish with my own time, resources, storage, and management. Toss in cloud replicated storage for redundancy and reliability, keeps it simple and easy to manage. That seems like a win that some may favor here. If I want to look at previous build info or share it with someone I am able to copy/paste or relay it, when I don't, it doesn't matter because I have my copies regardless. K.I.S.S. principal here folks.
Even using Notepad++ or Notepad locally would accomplish the same thing just not publicly nor solely reliant on a single entity or service that could just as easily remove it, or lose data in an upgrade/modification/crash.
I am one of the ones that may be considered "annoying" by some folks here for posting my son's builds in my sig, that's okay it won't bother mobile folks at least. I also am able to fit 2 builds into my System Specs, could do more with reduced details and more separated formatting. I feel there's already appropriate solutions that exist, though I can see where some folks may want this.