Some are good without gimmick spam but most are not and really depend on the latest to be successful...
But if you think you need to play with cheese spam gimmicks then go ahead I for one play with the units i like not the latest broken doctrine ability that everyone and there mom runs into the ground...
What if I like running volks and recon tommies(an example)?
What if I'm the one to begin the "gimmick" and it's lifecycle in EiRR?
Should I go all hipster-like and refuse to play a strategy I came up with just because "everybody is doing it now!"?
But, of course - accusing someone else of foul play is so much easier than actually adapting to what's happening on the battlefield and putting in some effort towards a win.