I wanted to jump in and comment but it seems there's a lot to review first.
I will ask a quick question though.
I'm in a living situation that requires me to be as quiet as may be. (Focus on quiet practice rather than recording).
I broke out my Focusrite interface and plugged into my Linux rig. As expected in Linux it's a technical journey to get set up. Really more effort than I had patience for at the time.
Moved over to PC (Lenovo Legion. AMD Ryzen 7, 16 Gigs)
It really intruded on my other apps.
Not a MAC guy but I do have an ipad. (probably no powerful enough)
Question: Do you guys use a dedicated workstation and if so what spec?
I do have a PC dedicated to my studio...I do recommend having a system specifically for music production unless it's just a very casual hobby...
Recording rig specs are a fluid thing and depend on use case...
In general, it's all about processor and memory...
Processors run the apps and plugins, and the more you have running the more processor cores you need...processors in general are fast enough these days to share a good number of tasks but eventually they do run out of bandwidth...
The number of tracks you have running dictate the amount of memory you need...
Audio processing does not need a lot of video throughput, so a high horsepower video card is not needed...although some plugin designers are starting to give users the option to use video card processing to run, so in the future this could change...
Of course having multiple SSDs is going to make it more efficient, having the DAW, plugins, and other apps installed on the system drive and sending the project and recorded audio files to a separate drive...also having another drive for samples and loop libraries is also a good idea...
It all depends on how you're going to use it...a basic 8 core processor and 16GB of memory is about the minimum these days...if you use a lot of virtual instruments and/or record a lot of tracks then more is better...
My rig is dedicated to mixing/mastering and was not designed to record, but spec-wise it would still be fine for most project sized studios...
I run an AMD Ryzen9-3900 12 core multithread processor and 32GB of memory...since I mix I tend to run a lot of plugins simultaneously, and with all the busses, sends, returns, and parallel tracks I usually end up with as many as 3 to 4 times the number of tracks running as I started with...I have 4 SSDs, one for system and apps, one for projects, one for samples and loops, and one for video projects...there is also a 4GB hard drive for backups and storage...
I'm intending to upgrade that system soon, moving to a 16 core processor and 64GB memory, which should keep me running for another 5 years...