I am by no means an expert on the subject, but I will say that someone coming from climbers to one stick and rappel, it can be daunting. When you first try it, you may find yourself in awkward positions, questioning your connections, sweating and maybe swearing. The key is to stick (no pun intended) with it and perfect your movements, positioning of stick and streamlining your equipment for YOU. There are many different pieces that work and some work better for others. You need to sort through what works best for you.
Aiders can be difficult to descend with in the dark. Some people on this site are young and agile. Hell, they can probably climb up and down a tree by itself or just with a rope! Lol. Some are a little bit older and a little less flexible and have to design our process accordingly. For me, I went from using a tether to climb, then to just using my rappelling line as my tether. I have gone back to using a short tether then switching over to my rappel line at height. I find it easy and safe. But I’m still mixing it up a bit. I keep my rappel rope in my backpack or in a cargo pocket on my pant. 35 feet of Canyon isn’t that much bulk. As much as I like redbeards water bottle method (and I have the water bottle and tried it) I’m too slow stuffing it back into the water bottle. Great going up but I spent too much time stuffing it back in at the bottom of the tree in the dark. But it’s a good system for minimalist efforts. I am much faster at just coiling it up and stuffing it back in the backpack or cargo pocket and then jetting.
Keep your gear as simple and safe as possible. There can be a lot of parts and pieces to these methods, which can require detailed sequences to be safe. Keep it simple so you don’t mess up and you will be safer. The Safeguard makes rappelling pretty easy and safe. But like everything, there is always risks.