I'm not JenniferW, but I'm pretty much in the same boat. Here's my political shortlist of things I care about:
* Medicare for All or an equivalent universal healthcare program
* gay marriage
* abortion rights
* trans rights
* climate change
* police reform
* Eliminating tax preparation
I have been a voter for 10 years. In those ten years, there has not been a single Republican candidate at the national level who has supported any of the issues I care about. In fact they work actively against them.
On the other side, Democrats support
* gay marriage
* abortion rights
* trans rights
And as far as I can tell no one except a few outliers who caucus with the Democrats actually care about Medicare for All, climate change, and police reform. Basically no one cares about climate change or tax preparation in a serious way.
So based on that, my political energy is best spent as follows:
* ignoring all daily petty squabbling between parties
* researching the differences between Democrats available on the ballet and choosing the candidates that seem like they can make headway on the things I care about.
* donating money to lobby for M4A and other causes I care about.
It's not that I think Democrats aren't worth investigating. I do investigate who I am voting for. It's just not worth my time to investigate every last belief of Republicans if I disagree with their primary positions. I have paid attention for the last 10 years, I know what they stand for. This whole idea that if you don't give Republican's 50% of your energy on every issue you're intellectually dishonest is bunk to me.
If the candidate is okay being a part of a party that thinks my gay grandmas shouldn't be married, they're not worth my time. (The official Republican Party platform STILL lists repealing gay marriage as a goal, in case people pretend the Republicans are past that.)