It’s the switch to digital ink in season 14, but also the first 4 seasons used a different animation studio.
I think if they’d wanted to they could keep a more unique style similar to the early seasons, but I don’t think it was a high priority. Also while they could do it now, it might not have been as simple when the technology was still relatively new.
Ultimately it’s the challenge of being on TV for 30+ years, lots of things change.
It’s the switch to digital ink in season 14, but also the first 4 seasons used a different animation studio.
I think if they’d wanted to they could keep a more unique style similar to the early seasons, but I don’t think it was a high priority. Also while they could do it now, it might not have been as simple when the technology was still relatively new.
Ultimately it’s the challenge of being on TV for 30+ years, lots of things change.