Is this really official policy/or unofficial commonplace occurrence ?

https://www.reddit.com/r/delta/comme...t=share_button

I am traveling with one other person. I am on the Neo A321. No elite status,

I bought 3 tickets for two people.

I have the 3 across in row 27.

There is an offer in the app to switch to comfort plus ( 2 window seats obviously not together ) for $110 a ticket
IF Delta allowed me to trade the three for two tickets ( a littlemore) would you do it ?
I am 5' 11 and 215 lbs and the other pax is a 13 year old kid.

Am better of with 2 comfort seats or 3 economy seats

Also The hyperlink function is not working if someone else want to insert it, I am fine with that