How to use a Thunderbolt RAID drive with Mac Mini

Moving from my old iMac to an M1 Mac mini and wondering about my legacy external hard drives and how to attach them for maximum performance.

I have a 6TB RAID 0 Thunderbolt drive who's speed is about 180 mb/s, so waaaaaay slower than the internal SSD of an M1 Mac (my M1 Air reads about 2400 mb/s). A single HDD plugged into the Air via USB C gets about the same read write speed as the RAID at 180 mb/s. So is RAID essentially pointless at this time given that USB C seems to deliver the same read write speed? I got a Thunderbolt 2 to 3 converter, so I could use the Thunderbolt RAID drive, but confused about if RAID makes any sense now.

Further, USB C can theoretically have speeds up to 10 GB/s, but what's the use of that when an HDD doesn't even run at more than about 180mb by USB C? I've seen USB C hubs which say they run at 5 GB/s, not 10, but it seems that's still way faster than the HDD can run, so for that 10 GB/s is no advantage over 5.

My question is, am I understanding this correctly? Also, is RAID essentially a pointless option when USB C is about as fast with a single HDD?