I am not a professional, but I have been tuning my cars, especially the ones that I take it to track. OLM drops quicker because you might be driving it harder, or at higher RPMs more frequently.
There is no "yes or no" answer for that question without seeing the datalogs. What I aim to do is, I try to get STFT and LTFT close to 0% all rpm range when it's on closed loop. It makes the low and mid range super smooth. For most professional tuners, it is hard to get 0% fuel trims, so they say anything below -+5% or -+10% is "acceptable" and they tune it that way because it takes too much time to tune precisely, and they don't have time to spend a week for each car (each car is different, even if they are stock or have same mods). If you know what you are doing, noone can tune your car better than you. The procedure is same/similar when it comes to open loop no matter what type of gasoline engine it is, advance the timing, adjust the fuel cells, and so on. I think it is easier and takes less time to adjust WOT or open loop, that's why tuners like to tune WOT more than low-mid range especially if it is a dyno queen car. The result will be like your car runs faster when you drive it hard, but runs like [censored] if you drive it slowly.
Long story short, as long as there is no noticeable detonation, same rev limiter in place, same driving habits, and using the recommended octane, I wouldn't worry about the longevity. To make sure, do the UOA and check the fuel trims when driving normally (under 4k rpm), and check ignition knock count in each cylinder after few pulls on 3rd and 4th gear.
