Tomj,
The GL-inet UI does more than make it easier. Perhaps its best attribute is that it allows you to reset the modem to factory conditions (e.g. when you are arriving at a new hotel) and then configure it from your phone. Stock Openwrt does not have wireless on, so there is no way to configure it with a phone after a reset. Whether or not that is an important use case for you is up to you. For me, I’m using the AR150 as an AP in my home, so I prefer no added UI. RangerZ has another use case.
Also, likely you haven’t bricked the AR150. You need to put it in u-boot mode. I’ve asked alzhao to make a new video for the AR150. Perhaps you could ask him as well and it will move up his priority list.