As you have stated since Catalina was introduced, disabling the SIP permanently is required to load the SoftRAID drivers. With the imminent release of Big Sur and the demise of Catalina will we ever see the elimination of the SIP issue with SoftRAID, not to mention the full use of SoftRAID on Big Sur?
Macbook Pro 14" Retina 2021 M1 Pro internal 1TB storage, 32GB RAM, two external T3 enclosures (2.5TB online storage), 6x500GB, EVO SSD, RAID 4; MacOS 12.3.1
Disable SIP was only required from a bug in 10.15.0, Apple fixed that in later versions of Catalina.
Don't confuse them. Secure Boot is a extensions check at startup. SIP is always active, while Secure Boot only runs for 30 seconds at startup.
Secure Boot must remain disabled. (on T2 equipped Macs only)
here is a article on what disabling Secure Boot means in reality:
https://blog.macsales.com/64201-secure-boot-and-sip-guard-your-mac/
Apple will change this requirement also, in a future version of macOS, but not Big Sur.
We are going to do a public beta for Big Sur of SoftRAID 6. here is the perma link to the current version: