Live or die by the front sight. I heavily ingrain it and you will hear me saying it on the range. It is a whole entire topic on its own.
I also get the sling of crap that it gets from those who don't train it correctly or who may not understand the principles, logic and body response that accompanies a deadly force encounter and the focus needed to help counter these issues under stress. Those who cannot get past the "aiming" academy indoctrination aspect don't get the rest of the equation, so the context is often lost in the translation. Unfortunately many academy level instructors don't get it either and are often at fault for not understanding correct context and maybe leaving scars on students.
In addition to "front sight", I ingrain shooters to exhale on the press. Under stress they have usually gulped in air or at least start holding their breath, which can create some big issues. Exhaling on the press can be trained or ingrained similar as any response we drill into our subconscious. It forces them out of holding their breath, which is common under stress and gets them to "breathe" and allows for better or correct focal or focus shift. This initial breath and exhale calms and relaxes the mind and body. Being correctly oxygenated, relaxed mentally and physically helps us to focus on what we need to focus on and greatly increases first round accuracy under stress situations.
When I yell out "front sight" on the range it is a reminder to the student of the type of focus I am looking for under stress and a quick reminder to them. Of course there has been quite a bit of target focus, threat ID, focal shift, breath, grip and trigger press work that has been heavily trained already. Concepts discussed and then followed by practical exercise. So the student understands that "front sight" is just a reminder that they are generally threat focused, holding their breath, death gripping the gun creating all types of negative muscular tension and mashing the trigger. It is a reminder to get their head back into it and perform in the manner that we have been training. Threat focus / threat ID, breath out during press out, focal (focus) shift as we near extension, touch trigger, press, follow through.