The biggest benefit of adobe CS is the buyout, which is the only advantage I've missed since joining adobe programs.
In addition, the speed of PS has always been interesting to me, since G3, I always have the opportunity to use PS to manipulate large pictures, I rarely feel that PS is very slow under the current equipment, even when using G3. adobe's app, the only situation that impresses me the most, the most unacceptable, is InDesign just released. In those years, when adobe and Quark were competing for the typesetting market, InDesign was so bad that no computer could use it smoothly, and both G4 and G5 were equally slow.
The last time I saw someone complain about the slow speed of PS was when they were working with a PS file with 100 layers, and well, no matter what anyone says, my training tells me that's just crazy.
Sometimes the progress of the times is more like a kind of forced consumption, software and hardware are like this, but if you have enough money, then nothing can stop you from spending.
In fact, I've always thought that the so-called "three generation OS support policy" are BS, and that this support policy affects a lot of things, like surfing.
Yes, I would say that if you continue to browse the Internet with the "old OS", you may no longer be safe. The reason it's no longer safe is because app developers have some kind of "in the interest" of updating with OS versions.
Google Chrome, for example, does not push new versions for OS before the current third generation. In other words, if your OS is already behind the current version of the third generation (currently it looks like Catalina is about to become obsolete), there's a good chance you won't be able to install the new version of Chrome, which is a security concern.
However, not all app developers follow this OS support policy, and your concern is that surfing, at least FireFox as far as I know, does not follow this policy. However, this will depend on the browser you are used to.
So, is it still safe to browse the Internet? I've already told you the answer.
And how long will the 2010 Mac Pro last? In my opinion, the only thing that could prevent this computer from continuing to be used is a failure of the chip on the motherboard, and that's the only possibility. If it's not failing, there's no reason why it can't continue to be used. Of course, this is not the kind of consumer behavior that any company would like to see, and while a 12 year old computer is really old enough by any measure, and my own WInPC doesn't seem to have lasted that long, it is rather odd that I have always considered cMP to be a pretty good computer, and in terms of hardware performance, it is still mid-range mainstream even in 2022. That's one of the reasons why I can't accept the so-called "three-generation OS support policy".
In short, if you can't learn OC, and you can't replace BT and Wifi (although it's really quite simple), then do it, buy Mac Studio, adobe CS will sing "Yesterday Once More" for you, and congratulations on joining adobe Creative Cloud, you will have no choice.
(adobe Creative Cloud is not without its benefits, you will get used to it)