Suggesting that
Toucannon have
Brave Bird replace its current
Beak Blast. For a mon that plays the way Toucannon does, unless you're in absolute desperation mode against an opponent that relies on contact moves, (Hitmonchan, Dodrio, and Bisharp to name a few), you'd much rather have Brave Bird's power over the burn chance. A look at Toucannon's stat spread and some of the other moves it often gets should further support this.
Its main goal is to wallbreak, and Brave Bird is a far better option to help it achieve this goal. And I haven't even talked about Beak Blast's negative priority yet.
See I know it's not fast, but with the nature of Toucannon, using a move that
lowers its priority and increases the already decent chance that it moves last is a huge no-no. This is especially in full effect against the mons that are in fact slower than the toucan, especially against slower Haze users, such as Cofagrigus and Toxapex, or in low HP situations against slower mons. I know Haze isn't that common of a move in the format, but Beak Blast's priority means that the Haze will happen before your attack lands. I guess that you could use another one of your other attacks, but against most Haze users you'd much rather use your Flying STAB, and the aforementioned negative priority halts your ability to. If you see the toucan in a low-health situation against a mon you're faster than, what sounds more appealing: Nuking the mon in question with the consistency of Brave Bird, or you take the time to 'heat up your beak' and they finish you off relatively unscathed other than that burn chance provided they used a contact move. I know what I'd rather do - weaken it with Brave Bird, dying to the recoil, then getting a switch into something that can finish what I just weakened. I guess it would be nice to have these mons burned, but it'd be nicer to have them severely weakened by Brave Bird.
The only real advantage Beak Blast has over the classic BB is the burn on contact and the lack of recoil. The negative priority is the clear nail in the coffin dragging it down so much, and it's not like the recoil is super detrimental to Toucannon as it's not meant to tank much anyway. I can
see the situations in which Beak Blast can be useful; against the mons that use contact moves exclusively, but after considering this, I then look into situations where I'd much rather have Brave Bird, and Brave Bird wins every time.
Basically, with how Toucannon plays, you'd rather it have the consistent offensive option.