Once i reach elite in trading and go and do combat should i expect that to decay as well?
OK. Playing Devil's Advocate... Why not? Is the mercenary in his late 50's still as capable as the young gunslinger in his 20's? Should his reputation not have faded somewhat? I'll accept that standing in the Pilot's federation could be more an 'honorary' thing that doesn't decay.
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For some reason computer games have shied away from applying maluses to players, as being too 'realistic' detrimental to 'fun'. I did like that some levelling mods for Bethesda RPGs forced players to continually use a skill, lest it degrade with time. Or that paper RPGs (and Mount and Blade IIRC) applied rules for skill degeneration with age.
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How is it good?
In the real world, explorers left home with the authorities often sceptical about their trips. On return they were lauded as heroes. In ED it's the other way around.
No. As I already said, it's the same in E: D. You go off exploring, the powers that be are sceptical, and become more sceptical as your absence lengthens (and you don't send any postcards). You return, you get the cash and reputation. Simples! Exactly the same surely?