I’ve seen plenty, actually, and they’re given more than 30 seconds.
I absolutely promise you that I do more research into candidates than 99.9999% of people. When I want information on them, I go to their websites, I stream/watch their debates, attend or stream their stump speeches, look up their town hall interactions, or write/email their campaign where almost 100% of the time, I get a reply from a rep who answers my question. If they have been in office already, I pull their voting records, look up their speeches, read what their peers say about them, see what their district/residents have to say… If you want that level of information, it’s your job to seek it. It is not the news’s job to provide it to you. They report on all things, not a singular deep dive on every candidate running in an election. It would simply be impossible.
What you are doing is tantamount to complaining that car commercials don’t give you all the details on the car they’re advertising. The commercial conveys they have cars, it’s up to you to research if the car they have is the one that you want.
And for all you say the victory speeches don’t matter, the thing you’re complaining wasn’t aired was a victory pontification, not a stump speech.
You can’t say “the news has the responsibility to hand me all this information” and “the media is biased” in the same breath. They are conflicting ideals. If they are biased, requesting information means you’re receiving unsatisfactory information. You can’t say “I get bad information from the news” and “why don’t they give me more information?”
The function of the news is to give a broad overhead of all current events with maybe a deeper dive on one or two stories of particular interest. Anything more detailed, you seek out yourself. It’s not the news’s job to do your thinking for you.
Every time I hear the “media is biased” or “information is suppressed,” I think of my friend who fled Russia. He gets a huge chuckle out of it and says Americans literally have no clue what suppressed information and news is. To him, suppressed information would be “is Trump even running because there’s nothing about it in the media, online, and on social media.” Not seeing one segment of one thing one candidate did on prime time, but still having it widely and freely available online would not be suppressed information, lol.