If you worked in an industrial setting, legacy tech abounds due to the capital costs of replacing the equipment it supports (includes manufacturing, older hospitals, power plants, and etc). Many of these even still use token ring, coax, etc.

One co-op job at a manufacturing plant I worked at ~20 years ago involved replacing the backend core networking equipment with more modern ethernet kit, but we had to setup media converters (in that case token ring to ethernet) as close as possible to the manufacturing equipment (so that token ring only ran between the equipment and the media converter for a few meters at most).

They were "lucky" in that:

1) the networking protocol that was supported by the manufacturing equipment was IPX/SPX, so at least that worked cleanly on ethernet and newer upstream control software running on an OS (HP-UX at the time)

2) there were no lives at stake (eg nuclear safety/hospital), so they had minimal regulatory issues.