After further looking into this issue, it appears that PlayStation decided to backtrack on their decision to cut off full functionality of PS3/VITA options over PSN:
https://blog.playstation.com/2021/04/19/playstation-store-on-ps3-and-ps-vita-will-continue-operations
Of course these functions still have been cut off in the mobile app, as well as their online store (accessible through web browsers), meaning the only access to PlayStation 3 & VITA titles are through their own stores (meaning their own devices) & remote installation is no longer an option (nor is wishlisting of those title, which I used to keep track of what I still wanted to purchase at a later date, particularly when one of those games/DLC went on sale, apparently no longer an important concern considering I haven't seen a sale on PS3 titles in over a year & a half, but this also means I am likely to forget about what I still wanted to purchase if I wasn't ready to do so when I found them).
This means that I am also pulling back on my own cutoffs, not entirely, but at least to some degree. Considering the mobile apps & site still have removed most PS3 functionality (with the exception of trophies, the only remaining remnants of PS3 & VITA games), I will still be removing PSN friends that haven't logged into the PS3 in over a year (with the limited exceptions stated before; roughly two-thirds of my PSN friend list has already been wiped because of this, with more expected to be removed in the coming months, as those users are close to a year according to PS3 login dates). In regards to associating my PSN account with other accounts, I believe I will leave this removed for the time being; if I do decide to re-associate my PSN account with other online accounts in the future, incoming friend invites on my PSN account will remain disabled (seeing as I was only receiving friend invites for people that were using a PS4 or higher, which I was not accepting after looking at the trophies on their profiles).
What will continue is I'll still be willing to purchase PS3 titles over the PSN store, as well as DLC for games I already own (or may acquire in the future, provided the PSN store still remains functional on the PS3), this may open up more options for games to stream on Twitch (provided I can get my Elgato Game Capture HD to work again with Twitch servers, the Elgato developers unfortunatley unable to fix this for over a year & not responding to inquiries about it). At this point a boycott against Sony products is an afterthought & unlikely to happen (unless the PSN store becomes inaccessible on the PS3 in the future, it's already having EXTREMELY noticeable latency problems).
Since the announcement of the PS3 cutoff, I also have been marking anything re-released on Steam as ignored; I will be going back on that decision to remove those games that were ignored if that was the only stipulation in that decision, however most of those games also had a Windows 10 requirement, those games will still remain on the ignore list as I still have not bit the bullet & decided to upgrade to Windows 10 yet...
Additionally, there was a detail on my Steam profile where I stated I did not recommend purchasing from Sony anymore, referencing this cutoff (which at this point has been backtracked after seeing the backlash they got as a result of their plans to do so); I will be removing those notes, however I still have not determined whether I will be re-adding those links to Sony products on my hardware specifications on my Steam profile (I may if I can still find store pages for them, but I don't intend on spending an extensive amount of time trying to find pages to purchase them from either).
