There are three main factors why other teams might not be doing what the Cleveland Browns and Andrew Berry are doing:
1 - Lack Of Front Office Vision
They just aren’t as aggressive and smart to work this out on how you can weaponize the salary cap to give you the best possible team year in and year out.
While this might seem silly to say and how can some guy in England sat behind a keyboard work it out but we only have to look at how slow professional sports are to catch up. Why did basketball wait so long to embrace the three point shot. Converting an idea and having a general manager to convince an owner to spend $50m a year more than average isn't always the easiest thing to do.
2 - Talent To Pay
You need to have the talent to give massive contracts too and that means drafting well as the first point. While it might seem like there is lots of great talent in free agency most players signed to major deals aren't on that team for year three of the contract. They are regularly overpaid and underperform their deals. You need to find the talent on cheap rookie deals and then extend them early.
This is why it is essential Andrew Berry adds more draft picks via trading down, keeps having success in the draft, and finds the next wave of talent to extend.
You don't want to go the Rams route of trading all the best picks for expensive veterans, having a really expensive team plus a group of cheap rookie contract players is a perfect combination.
3 - Cash Poor Ownership
Their owners just aren't as cash-rich as the Haslams. While people might have opinions on Browns' ownership on how they have hired and been involved, one thing they haven't been shy about is spending money at an incredible level on the 53-man roster. All teams will have cash budgets they spend each season and it is clear that the Browns have one of the most generous owners in supporting Andrew Berry's goals.