I believe it is bcoz we always stuck in jam and short distance driving. Car rpm kept too low making alternator unable to charge the battery at optimum level. Auto gearbox creep forward function which hardly require u to press the accelerator unlike manual gearbox cars. From wat i understand, lead acid batteries should be kept as close to 100% capacity as possible for longer lifespan.

Plus these days cars idle at ~650rpm compare to older cars in the name of emission control, compare to older gen cars that idle at 900rpm.

Japanese cars must compare to japanese cars. Cannot compare with conti. Conti car batteries alot bigger. DIN100 is fairly common and freaking expensive compare to a typical 55d23l in a camry

Minimum speed limit?? Ada ka such thing in msia?? Indon i know they hv.
Try this though, before you fire up the engine everyday, turn off all electronics first including air cond, auto headlamp , welcome lights and car audio.
I even hv a habit of switching off my air cond 200m before reaching my home and turn off engine.
So far my MF batteries can last me 4 years.Jap engine.