I haven't been on a team that did the "guy shoots a wall" strategy since my first HM clear, but I find it vastly superior to the bubble distraction.
First, it's foolproof. While I only remember a few wipes from Titan mistakes (falling off ledge, getting killed trying to rocket), it's more than the 0 the wall shooter would assuredly contribute.
Second, it frees up a bubble for the Ogre room without the need for multiple titans. One team I was on had one titan, and that lone titan was using the bubble for the boomers. Not having the bubble in the ogre room caused multiple wipes. The bubble in the ogre room helps against the second ogre and the ascent up the steps, which is the only dangerous part of the fight for the rocketers.
Third, it is a more consistent way of keeping the boomers distracted. A couple of times, I've seen the boomers shoot the swordbearer after the bubble was up because the Titan didn't stay to aggro (or whatever they have to do, I never do that role, so idk what exactly went wrong those times).
Yes, I'm sure everyone I played with is just the worst or whatever the response will be. I am just relaying my experience. And yes, the wall shooting is way cheesier - to the point of really being an exploit as opposed to a strategy. But all that said, I consider it a much better method if I have to choose one, and it's odd seeing people ignore the benefits it provides, especially in random groups. Of course, if your group of 4 can't consistently dps Crota enough to take down the shield in a timely manner, the bubble strat would be the only viable route. I am also aware that having a stealth swordbearer who needs neither strategy is preferable.
All that said, I feel like people who roll in consistent groups shit on random groups who do whatever they can to get by, and it's pretty easy to be high and mighty about what methods are allowable when you're not in that position.