The difference is negligible, Christ who cares if it isn't the most "optimal" way of pulling. As long as the Tank can do his/her role (hold aggro, keep themselves alive, respect mechanics, not overpull to the point that it's a wipe, etc.) that's all that truly matters. Maybe the Tank in question just finds it more enjoyable to do it the other way? As long as he/she is not ruining the group, it's chill. It's okay to have a personal preference, but don't try to enforce it on someone else (especially the person who's in charge of pulling, if you want to pull like this when you're tanking, then go crazy), that is rather vain.
For example, in every single Ex Primal I tank, I always Voke first then use my ranged attack. I love how much range Voke has so it's my preferred pulling skill, and I just used the ranged attack to establish proper aggro. Is this the most "optimal" way to pull? I don't know, and I really do not care. Why? Because it works for me & it doesn't hurt anybody. If someone tried to critique me because of that method, yes I would be annoyed because there's no meaningful reason to, you're just trying to nitpick and dictate my playstyle based on what you personally want. And that is a bit disrespectful.
Also, nice assumption, just because I find issue with the "suggestion" you listed, yes, I must have some kind of personal problem and be against all feedback /eyeroll.
Come on dude, stop it. You know next to nothing about who I am or what kind of player I am, so trying to tell me about myself as you're doing right now is almost laughable. If this is how you speak to people in game (I really hope it's not), then I understand why you would you'd find yourself in conflict.
I want to tell you something: when you give out suggestions because of remedial things, you are essentially telling the other person "Hey, you don't know what you're doing. I know what's best, so do this." Even if your intent is pure, that is what it comes across as. Here is a rule of thumb I've followed for years that I've had very positive results from: As long as people are playing their roles (Tanks holding aggro and popping CDs, healers healing/shielding, DPSs doing decent damage) and respecting mechanics, and progressing through the instance, just leave them alone.
Like another great poster said, we are just fellow players, not authority figures.