This is a great populist message but not sure it can be backed up with enough data at any meaningful enough scale to enact policies. Just like if I posited, "Generally, there are a lot of smart, capable and hardworking people who are just surviving check to check." It feels good and there are plenty of anecdotes to back it up, but it's too vague to make policy decisions upon. Raj Chetty's research [0] on social mobility dives into the complexity of it all.
[0] https://rajchetty.com/publications/
Edit:
> But it's only a disadvantage, not a roadblock.
You really nailed the crux of it here in terms of equality of opportunity vs. equity in opportunity. The unhappy compromise to avoid irreparable divisions in U.S. society lies somewhere between removing roadblocks vs. addressing disadvantages.