RAID is more likely to fail than a single disk. You have the chance of single-disk failure, multiplied by the number of disks, plus the chance of controller failure.
RAID 1 and RAID 5 protect against that by sharing data across multiple disks, so you can re-create a failed drive, but failure of the controller may be unrecoverable, depending on availability of new, exact-same controller. With failure of 1 disk in RAID 1, you should be able to use the array ‘degraded,’ as long as your controller still works. Depending on how the controller works, that disk may or may not be recognizable to another system without the controller.
RAID 1 disks are not just 2 copies of normal disks. Example: I use software RAID 1, and if I take one of the drives to another system, that system recognizes it as a RAID disk and creates a single-disk, degraded RAID array with it. I can mount the array, but if I try to mount the single disk directly, I get filesystem errors.
The filibuster is just a Senate rule, though, which they can rewrite any time they like (though usually only after an election).
The 2017 repeal effort used a budget reconciliation mechanism that is not subject to filibuster. In fact, a lot of the 2017 legislative awfulness used the budget reconciliation hack, where the Senate can change laws in order to ‘balance the budget,’ so long as (by convention) they don’t change policy. 2017 repeal, of course, famously failed because John McCain thought they shouldn’t use that process and voted against it.