Well, look at what Atlanta lost!@
If you can get a 27 year old FA with upside left at a reasonable price, sure.
The problem comes from either paying 30+ FAs for past performance or guys in their prime coming off their career season (how many sustain that peak season?) as if they'll repeat that year for a decade.
You need to come up with something on the order of 40 WAR to be a real competitor.
Now if you grossly overpay for 10 of them (say $10M a WAR, easily done, one $20M flop like Didi, one $30M contract for a guy you thought would give you 5 WAR but only gives 3 WAR, so say $50M for the other 7 which is good value), you have to find 30 WAR from the other $100M.
It's a matter of efficiency, if you have a great farm system you can afford to gamble on FAs because you can eat a big contract with only mild indigestion. If you don't have young cheap talent, you can't afford those mistakes.