The system is split into two parts-disconnecting the wrong switch does nothing. If all 4 are going you go for the hazard switch not turn signal. Don't be surprised either if you can't find any flasher units, many cars have them incorporated now into more expensive bigger switching units that have no flasher to change out, it being part of a switch that will not interchange with anything else.
Part of every car company's 'unitizing' strategy now, where they take commonly previously easily available cheap individual parts and manufacture them into more expensive sub-assemblies of several parts to make the parts sales much more lucrative. Like a/c hoses for example, before you could get dryers or accumulators separate and the high and low pressure hoses as well, lots of them are added together now in one assembly to make for whopping cost a/c system hoses that you buy one of to get all those parts. It's about selling several parts to the customer for him to commonly get the one cheap one he needs. It also decreases assembly time on the car production line and inventory costs with fewer numbers. A win-win-win for the company.
They do it to artificially raise the average parts sale up, can't afford to build and support the glass super dealerships without doing it.