Yes, you are overthinking the complexity of the electronics and their impact on the transmission operation. The SRM function has nothing to do with the robustness of the transmission itself. The MT transmission is fairly robust (people are throwing 600 hp at it seemingly without issue), although it has some quirks that people are fond of complaining about. The CMC and CSC are notoriously prone to failure. It's not silent like a Lexus and it can be a bit clunky if you don't drive it perfect. However, SRM will help you drive it smooth. In fact, SRM will probably decrease wear on the transmission and especially the clutch for the average driver.
The AT is probably way more electronic and is still pretty solid. Its a really good transmission for a non-DCT. The AT's biggest drawback is its inability hold power - it's only rated to 295 ft-lbs of torque or something.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |