Is that it eliminates two very important variables from consideration: field position and the game clock. It also eliminates special teams from consideration as well, with the exception of the PAT/FG unit.

but with the playoff games taking over the sport, would 1 guaranteed possession under normal football rules extend the game a significant number of plays on average, with only 2-point tries on TDs, and if tied after 1 possession each, next score wins? Shootouts are tolerable in the regular season, but I would prefer the new NFL style OT in the playoffs. You have a better sense of just how big of an issue number of plays is for college age athletes, but unless that is a compelling case, use the NFL rules.

I admit to being a fogey and think tie games are OK The best OTs in sports are those which stay closest to normal rules. Baseball. Basketball, playoff hockey, and golf are good in that regard. Tennis and FB less so

Your idea of moving the ball back rewards god defenses. I hate OT field goals on an initial 4th and 15

Made OT special in playoffs

I agree with the rest of your post, too

At least have to make a 1st down or 2 to kick a FG

As a HS wrestler before reg season OT, I had 2 ties: 1 vs a very good wrestler. 1 vs a poor one
1 got me a big pat on the back & the other almost cost me my starting spot