Bazaar seems cool, but yeah I don't think the linked video did a great job communicating why anyone who already uses GNOME Software or Discover would want to use Bazaar instead, aside from having a donate button - which is nice, don't get me wrong! - and maybe being slightly faster to install stuff. Most of the features he spends a lot of time on in the video are features also present in both GNOME Software and Discover, or are just inherent to the Flatpak ecosystem in general.

To be clear, reinventing the wheel is not necessarily a bad thing, and it's not like any of the existing app stores are the most perfect thing ever so I'm not shitting on Bazaar here, I just don't feel like it's super compelling in an obvious way yet. Nice to see more of these types of smooth app store experiences coming about though.

Also vaguely frustrating that Bazaar selected a name that is already used by multiple applications that are (currently, at least) better known, making it a lot harder to search for information about. I assume that will sort itself out eventually though as it gains traction and popularity.

I haven't used Bazaar myself, but in general, frontends like this usually just do that behind the scenes. If you are comfortable/used to using another frontend/method, you probably won't need it. It's all about the GUI, comfort and also usually the selection of featured apps (although that could be distro-dependently handled, too). The one thing here I personally agree with being great which I personally haven't seen like this (I'm used to Pamac, myself), is having fundraising/donation info right in the GUI for the projects.