I have seen too much Positive from it to consider it doing more Neurological damage than the benefits we all get from doing them. Our training is conducted on pretty Average, below average grass.
Out of the million movements we all do on a day to day basis - i highly doubt ONE rep would cause such change like you’re suggesting. Now, i could be wrong - but, i would be more than surprised if it happened. Shocked at the least.
Esp when one considers this, to become Ok at something, one needs to practice the said movement a fair amount of time. Perhaps an Hr a day? To get good, more Hrs - perhaps 1.5hrs and really focusing on Form. To get Great = more time, more focus on perfection on every movement. If one is say swimming, doing 1km every 20min, they could be doing 4-5km per day. How many PERFECT arm strokes is that? Each day. Thousands. Just to perfect a 100m (or whatever) Dash lasting less than 1min. I’m sorry - i cannot get my head around 1REP - Not when people are training in the Thousands.