Why don't we ban all trading ? Then no one will ever feel cheated.
Are you seriously advocating cutting back on big trades because somebody winds up with an advantage a year or more in the future ? I would bet that most trades involve players whose value doesn't stay equal in the future, and that's absolutely unavoidable.
In an effort to level the PB playing field I'm hearing a lot of noise about curtailing owners rights to make trades because either some people can see into the future or we just don't want to take a chance that one team will "win" the trade down the line. This makes zero sense.