Alowak only situationally 2HKOs the entire meta. The statement " it 2Kos the entire meta " is misleading. Hoopa-U 2HKOs the entire meta. Kyub 2HKOs the entire meta. Alowak 2HKOs things if it predicts the switch right and uses the right move, and, a very big IF, if it outspeeds them.Marowaks Niche its that its not another passive tank, its a powerfull tank that checks the plethorra of ou offensive threats and punishes hard cause it 2Kos the entire meta thanks to its raw power (which by the way if you lack flare Blitz lando easily comes more than one time), also vs stall the recoil doesnt matter cause in that Match up marowak is not supposed to tank but its supposed to break by itself or help to break stall teams making the job of other breakers easyer.
When you try to play Alowak as an offensive mon, you pay a greater opportunity cost in giving up it's passable bulk (read: if you're running max attack, you're not running the tank, and if you're heavily Spe invested, you done fuxed up) and cutting into it's passable longevity (by using blitz), and in turn, you're giving up it's niche as a more-than-one-time-counter to top tier threats. What you get in exchange for this opportunity cost is a one time nuke.
That's not a good exchange. Like, you can choose from soo many wallbreakers that can actually come in and wallbreak more than once, that can outspeed things, that have better SE coverage even. By using max-attack Flare Blitz, you are not utilizing Alowak's main niche. You are attempting to create another, inferior, niche that is wholly, 100%, entirely outclassed.
If you're saying 'recoil doesn't matter vs stall' and that Alowak's niche is 2HKOing the entire meta, I really think you haven't used it enough to understand it. Alowak cannot stick around long enough to do it's job if you're playing it as a wallbreaker. It's job is NOT to 2HKO things. It's job is to hard counter threats, fuck with volt-turn, steal momentum, and try to smack 1 thing pretty fucking hard every time it comes in, before switching out immediately. Alowak softens the opposing team, it's a utility of this poke, not the main feature. The main feature is typing + lightning rod.
There's simply no reason to run wallbreaker Alowak when it will only be able to do it's job in situational matchups (it's not at all uncommon that an entire team will outspeed your Alowak) and there are better wallbreakers in the tier. lots of them. there are no better counters to volt-turn, genesect, pheromosa, magnezone, buzzwole, tapu koko, etc.
all rolled into one.
But really I guess I just encourage you to try it. Both sets, but try wallbreaker and I bet you after a couple of games when wallbreaker-wak just isn't pulling it's weight, you'll feel you've wasted a slot and either change it out for a better breaker or change to the tank set.
EDIT:
ppl keep saying Alowak checks things. Be real, Alowak straight up hard-counters the things we're talking about. THIS is it's niche.