If the lamps are operated many hours per start, the starting wear does not play that much role anymore, so the higher reliability of the instant start means less problems in the field - the IS does not need so perfect lamp contacts (few Ohm contact resistance on RS means that cathode does not get sufficient heat, so the lamp does not start), less wiring, so less prone to wiring errors, mechanically broken filament does not mean nonworking lamp, just high enough ignition voltage on IS means less sensitivity towards humidity or low temperatures (RS needs to have the voltage limited, to prevent cold electrode start in favorable conditions),...
Note, by the "higher reliability" I mean comparing two otherwise equivalent systems, so e.g. both autotransformer style, comparing the reliability of "magnetic" RS versus an electronic IS does not count...
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