You could have a long thread about all the ways that PHI has botched things but in the summer of 2019, they gave Harris 5 years / $180M and let Jimmy Butler go to Miami for 4 years / $142M in a sign and trade where they got Josh Richardson. Then the next year gave Simmons 5 years / $177M. Oh and in that wonderful summer of 2019, they also signed Al Horford for 4 years / $109M.
They let the best player go, overpaid the likely worst (and are stuck with Harris), and now they are going to trade off Simmons. Richardson and a pick (turned out to be Bey) were traded to Dallas for Seth Curry (who has played well). Horford and picks was dumped to OKC for Danny Green.
And yet somehow, they are a pretty good team.