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In a well organised system you have access to the trap via a removable grate or even entirely removable trap. Outside you should have rodding access.
In practice there are a lot of showers with too little fall on the waste because the joists are not that wide and sometimes they are running in the opposite direction you would wish them to. Those showers can be prone to slow running.
Airhead
Been meaning to ask for years but always forget- these are uncommon in Sweden where I live, mostly a shower space floor here will be tiled or have a plastic mat, sometimes there’s a sort of booth where the tray is on little feet with a pipe going to the (much larger diameter) floor drain. The things you have look like they’re fixed into the floor permanently. How do you get at the drain to clear it if need be, it looks very narrow?