Hello, fellow Tenno,
Having done a search for related terms and turned up negative, here I am. I apologize if I've missed someone's well developed thread on this subject.
A short why
Recently, I've been spending a lot of time playing the funderful, beautiful, broken angel of carnage warframe, Valkyr. Using Hysteria as often as I've come to do so, a thought struck me. How useful it would be if, instead of trying to gut feel the duration of Hysteria, there would be a little counter ticking down it's duration for me, so I can do a deft front flip away from enemies and avoid that pesky damage caused by proximity to survivors of my rampage. This would work well with other warframe abilities as well, like the invulnerability portion of Trinity's Blessing, the duration of her Link, Loki and Ash's invisibility, Ember's Overheat and Valkyr's own Warcry. It could also work well as a helper for abilities that do not directly affect the warframe, of which non-repeatables such as Nekros' Shadows of The Dead and Terrify, Nyx's Chaos, soft repeatables like Loki's Decoy, Saryn's Molt and potentially even fully repeatable but mission critical abilities such as Vauban's Bastille or Frost's Snow Globe.
A not so short how
Obviously not all of the abilities I've just mentioned were created equal for visual feedback regarding their imminent end. Perhaps most of them have a cue near their expiration, as I believe Vauban's Bastille does with the "sparklies" near the deployed sphere fading a few second before the effect is about to run out, and I am just missing these cues. If this is the case, and we would want to retain some measure of immersion by avoiding numbers ticking down, all I'd ask and suggest is to extend the initiative of subtle cues towards all the abilities that would benefit from it, and to please keep these cues consistent to the last 1-2-3 seconds of the abilities, unaffected by duration mods. Also, maybe make some of them a bit more obvious for those of us less perceptive? Please? ^_^
If visual feedback on the play area itself is not the way to go, then perhaps the ye olde icons with numbers that tick down is the right option. Indeed, this is what I had in mind, to begin with. So, perhaps a mini icon of the ability used taking a discreet, tastefully spaced and sized residence under the box that includes your personal warframe stats. Perhaps it could even be a toggle-able box like party health values, and the two options of visual and numeric feedback need not be mutually exclusive, with the numeric being optional. For non-repeatable abilities or soft repeatables that cancel themselves on recast, either affecting the warframe or not, this would be simple to choose representation as a single icon, but what about the field of snow globes? I think the most straightforwardly useful option in that event would be to keep tabs on every repeatable ability that involves a duration, and only listing the one that is about to expire first, then showing the numbers for the next one in line and so on. This would leave it up to the user to remember the order of Snow Globes, Bastilles or whatnot, but let's start with the basics and go from there, shall we?
On a final, small note, I very much enjoy little flourishes, like the icon being a little bigger and fading into size when it first shows up, so you know that something new just happened. Let's have some of that, please?
Thank you for reading! : )