I think you may have missed the point. When a hiring manager looks for someone, the ideal candidate is the one for whom this job is the ideal move.
This means to keep you happy and motivated it should be the next step for you, so the interview should be a challenge, but one you are able to rise to.
People go to interviews and feel they handled every question easily and then wonder why they didn't get the job.
The reality is that the interviewer thought either that it wasn't happening on the fit and gave you easy questions, or that you came across as overqualified, so would soon get bored.
A good interview is one where it gets more challenging until they find your level, and that's the level they want.
But regarding the silence, get used to it, it happens all the time. They just don't want to deal with saying no to you in case you push on why, and often this is a gut feel thing, sometimes the planets just don't align.