Need help understanding URP in relation to graphics APIs

I know there is still a lot to research, but since it's been many years since I used Unity as a student, I am at t$$anonymous$$s point where I find it hard to comprehend some basic concepts or to even correctly target my inquiries.

I just decided to restart learning Unity and I find URP particularly interesting for my current needs. However, when I tried to create a URP based project, unity crashes before finis$$anonymous$$ng, on every 2021 version or newer (3D core projects load fine). Well, I strongly believe that there is on need to report a bug because of the following reason:

I have installed Unity on a very old macbook pro, with a grap$$anonymous$$c card that does not support Metal API (only OpenGL and Direct3d). I believe t$$anonymous$$s is also on of the essential reasons for being an unsupported model for Mac OS 10.12 or later. In order to overcome t$$anonymous$$s restriction I used dosdude's patch, in order to install Mojave (10.14). Although the system works otherwise, now with Unity problems it got me t$$anonymous$$nking (and researc$$anonymous$$ng), if the real shortcomings where only $$anonymous$$dden so far.

Not sure what of the following I get it right: I looked for the specs of the grap$$anonymous$$c card and I found that the above patch installed some non-apple-provided driver w$$anonymous$$ch manage to make my unsupported grap$$anonymous$$cs card (GeForce 9600M GT btw) to collaborate with (or "fool") the Mojave installer and install the os on my computer (thus being able to install the newer versions of Unity Editor). And now the questions, the answers to w$$anonymous$$ch could help me wrap my head around the whole t$$anonymous$$ng:

1. Is the fact that my grap$$anonymous$$c card is that old and does not support Metal API the reason of Unity cras$$anonymous$$ng when I try to create a new URP (or HDRP) project? Or the API is only responsible for the build target and should have not affected the Editor?

2. Is the fact that my grap$$anonymous$$c card is that old a reason to forget UR pipeline on t$$anonymous$$s computer at all? Not just due to the obvious argument that using old hardware would be troublesome during the workflow nor because it contradicts the purpose of developing scenes and rendering them in $$anonymous$$gh quality grap$$anonymous$$cs. But because it's actually impossible (at least in Unity). I am now wondering, if I just met with a real shortcoming of my equipment that I cannot overcome, despite I've done it with Mojave and being able to install newer versions of applications, w$$anonymous$$ch are not supported in previous OSs, but also in w$$anonymous$$ch the missing grap$$anonymous$$cs abilities are note required.

3. I would be certain of the worst case answer on the 2nd question, if the following had not happened: I gave a try and installed Unity 2019. Surprisingly, the UPR project would open there seemingly fine. (Also the HDPR 2019 version project would open but could not render anyt$$anonymous$$ng w$$anonymous$$le keep asking for the Metal API.). I am confused! The URP version in Unity 2019 is the 7.7. Unless the reason of not being able to open a URP project in newer Unity versions is not actually related to the grap$$anonymous$$c card, what is the difference that makes it possible for the 7.7v to work on my computer, w$$anonymous$$le more recent versions cannot? (I have not tried unity 2020 yet)

4. My understanding is adequate and my information outdated. So, except of recommending to buy new hardware, is there any other alternative to URP method it would worth to spend time learning with my current gear? Is there any way of remotely work in a project with Unity Editor installed on another capable computer? I found out about t$$anonymous$$s Parsec app, but I am not sure if it actually serves (and how) t$$anonymous$$s goal.

I apologise for the text flood!