Quoted from Wolfmarsh:https://www.cbr.com/avengers-endgame-steve-rogers-peggy-carter-husband
From the writers, Steve Rogers was Peggy Carter's husband referenced in Winter Soldier.
And no one notices that the husband of Peggy Carter, agent of SHIELD, looks just like Steve Rogers?
Never mind that if it's the same timeline, Rogers lets Bucky be tortured and turned into an assassin over the course of 70 years.
Making it the same timeline makes it...messy.