The west Wales outfit were depleted by more than 20 absentees for the clash, through injuries and international call-ups, but led 13-6 mid-way through the second-half.
But the Warriors battled back and put the Scarlets to the sword.
“There were lots of positives at half-time — we were playing well, playing in the right areas, showing good physicality and turning the ball over,” said Easterby.
“But in the second half Worcester held onto the ball much better, got an early score and we started to slip off a few tackles. Two of their tries also came from our mistakes.
“There were a lot of new faces in there for us and the younger players would have learned a huge amount.
“They would have learned that it is tough physically at this level because Worcester brought on some big ball carriers in the second half.
“But I was really pleased we were able to expose those boys and they will only be better for this experience.”
“I thought most of those stood up and delivered a performance.”
The Scarlets established their seven-point lead thanks to an Andy Fenby try and the boot of rookie fly-half Owen Williams.
But the Warriors fought back and grabbed a brace of tries through Ben Howard, Semisi Taulava and Jake Abbott.
Electric wing Kristian Phillips hit back for the Scarlets but the result was put beyond doubt by Neil Best’s late score.
The Scarlets take on Cardiff Blues on Saturday, desperate for a win to keep their Anglo-Welsh hopes alive.
