Samsung separate washer make more sense when one break down, another one still can use?

Samsung combo: individual unit of washer & dryer. Because separate washer+dryer, when stacked up you need to be tall enough to reach the dryer dial, might be difficult if you/tenants/family are short. You can easy to replace the units and you don't need experienced/special installer to bring in.

LG Washtower are two separate units but housed in one shell & share one control board. Easy to access the buttons because at waist height. The washer & dryer cycles can be synced to match clothing/load type. Visually looks sleek. But expensive+bulky and need installer that knows how to install the tower unit properly.

My usage of combo for 15yrs experiences, the breakdown cannot use each other is non-existent.

If the dryer side breaks down (heater spoil example) the WM is still can run.

If the Washing side is broken down, just bring it to Self laundry. You not going to handwash for sure.

For big item like WM, the service guy is coming to your house to repair. Not sending out.