I find that a lot of the time I will end up choosing powersets based on aesthetics just as much as their strengths, and I tend to choose sets that don't obfuscate my character's costumes when they're on. While there are definitely enough sets that don't have wild VFX or have Minimal FX options, there are plenty others where the powers can be coloured but not removed. Now, I don't necessarily want every set to have a Minimal FX option, what I would love to see are Combat Only VFX, much like how they're done with auras. That way we don't have to detoggle a bunch of powers just to look at our characters, and remember to power everything back on once we hit the mission. And if we wanted to "power up" in a social encounter, it's as simple as entering a combat state.
I don't know just how much work it would take to enable this, but at least the possibility seems to exist, considering how many auras have exactly this ability. I'd love to love sets like Dark, Fire, Ice, Radiation, etc. Armor sets, or others like Sonic with its big radio wave bubble only having active FX in combat. Also, obviously being a cosmetic option, having them Combat Only or "Normal" can be as simple as a costume change, which allows for some creative options, too.
If the suggestion's already been made or already shot down, let me know, but it would be something that would get some people like me to try out sets that they don't necessarily aesthetically enjoy.