Mushoku Tensei ending resolves the conflict at the start of the arc & the conclusion of S1. It was a bit of a bumpy ride to get to this point, but the last few episodes were definitely some of the best in the series to me.
I'm glad they showed things almost entirely from Sylphy's perspective here as the reunion with Rudeus is because of her own efforts (with a major assist from Ariel & Luke). Had it been from Rudeus perspective it may seem as though she was being coerced into a relationship rather than pursuing something she genuinely wanted. This is something MT generally does well as it will timely shift away from Rudeus to give other characters a stage to show their motivations leading up to a climax.
We also see a bit of role reversal between the two. Sylphy used to be the crybaby that was always vulnerable. Now its Sylphy standing tall consoling Rudeus at his most vulnerable. Not at all the weakling as we once knew her to be. The contrast between Eris leaving him and Sylphy appearing to be gone, only to walk back into the room was very well depicted too. Even better than it was described in the WN.
This arc was important to give Rudeus a foundation to build upon. He's now rooted somewhere, and to someone, that he can call home. No longer a wanderer searching for purpose and that starts to change him quite a bit moving forward. Now to look ahead to part 2 in April which should be received as well as part 2 of season 1.