Agree that the drive chain is a bad comparison, but a motorcycle that has a sealed primary case with chain which connects the engine sprocket to the clutch shell sprocket assembly such as on an old Iron head Harley, Triumph, BSA etc, might be a good comparison for running a tensioner etc, it has its own lubricant and all the primaries I’ve seen run an oem tensioner. The oil levels are usually at a level where the lower chain run is submerged in the oil, Long life setup for sure.
