[Is Soloing Even Valid]

Is soloing even valid way to play the game ? my reason for soloing  I don't just want to run and gun all the time and other time there is no one playing the map. but i don't want to have to use all my revives on one map.  I know there are some Warframes that can solo very well or just stack tankyness, but i don't want to play a tank all the time i want be able to play strategically and thoughtfully to get trough some levels.  I also haven't reactored any of my warfames or use froma's on them and i don't all the mods or many max out. but should i have tooo ? i am not to far into the game where i have that much ability to do so. does that mean I and others at similar stages can't play missions on solo ? any warfames or ability or mods to make it more viable?for not max out or non tank waframes 

[Costless (Or Separate Cost) Resistance, Auxiliary, And Electronics Suites Slots]

I like this idea .  but out of curiosity would these hardware slot be able to interchange with them self's could i put 3 resitance types on them or 3 electronic types or 3 of auxiliary, or some mix between them like 2 of one kind and 1 of another. Or would it be 1 from each kind ?

[The Problem With Banshee And Why She Is Not So Popular =((]

I like to play banshee, i play both in groups and in solo. i think she could be buffed a little, but i think that a cool rework for the sonar could be that it mark weakness on  enemy's that  pass through the sonar and only reveals enemy on radar that are in range of sonar at any time during it. And for silence it think that i should cancel out noise that occur inside the range, i have silenced but when i go to shoot everyone outside the silence goes on alert. if that change to were that does not happen that could really make it much more effective as a skill. these are just some thought i had that could make both group and solo play much more enjoyable and versatile. would like feedback and comments about this idea? could this work or not ?