Yeah I agree with that. If they were going to implement brawling, a few basic functionalities would have been nice.
The problem is creating that "queuing" system though. Because it's not just about "flat stats" to determine a player's strength. But things like a scoreboard, a "team marker" (like choose your team color), a "referee mode", a dps-meter, or things like that would've been awesome (and not so hard to implement imo).
Yeah, there doesn't need to be a rigorous matchmaking algorithm for brawling initially, even though something as simple as win:loss ratio like hearthstone would suffice for the mean time. But then there would have to be rules surrounding what determines a win or loss (probably best of 5 with respecs/regears in the middle being akin to sideboarding).
But yeah definitely a shame how even simple access to personal dps meters is so taboo, being unable to see breakdown of damage from spells, etc. Anyways, I digress.