world lawn and encore are different brands.
Encore has been around a LONG time, about as old as the ransomes bobcat.
That model mower there has been out for a long time without many changes.
World lawn is actually a good mower too.
World lawn bought the Encore manufacturing facility to better mass produce their mowers. But kept the encore company intact.
World lawn mowers are essentially exmark mowers that are no longer under patent, so can be reproduced now. So when you buy a worldlawn, you are basically getting a 2001-2003 era exmark machine in showroom/brand new condition.
They are cheap because they are older tech, not because they are built like junk.