tl;dr: Basically don't worry, just go ahead and contribute!
Is it wrong for someone to post an answer that does not meet their own up-vote standard?
Question: Is it wrong to have a less stringent standard for up-voting than we have for posting answers?
Is X wrong...
No. We have best practices and various community votings, and we have a code of conduct and moderation, but "wrong" doesn't seem to be in the Stack Exchange universe, nor does any similar absolutism.
"does not meet own up-vote standard" & "less stringent standard"
Hmm... apart from gamification issues, one reason we can't vote on our own posts is that we simply may not be as objective judging what we just wrote. It's the same reason we folks generally can't proofread their own writing and ask a friend or colleague to do it, and the reason Hollywood makes such heavy use of test screening.
I think the only possible strategy is to do what we do every day, throw ourselves at the mercy of the court.
In fact I think the question is based on a flawed premise that one can apply the same standard to their own posts and to those written by others.
Having written about five thousand SE posts I can say for myself that the ones that are best received are almost never the ones I worked the hardest on in terms of time, effort, thinking, trips to the library, etc.
I never second-guess myself. I just do what I can based on a given day's "procrastination budget" and how deeply I want to overspend from that budget.
"up-vote standard" & "standard for up-voting"
Do most people really have a concrete, objective standard when they vote? For those that feel they do, is it even a good standard? There are punitive1 voters and preemptive2 voters, reflexive3 voters, stingy and generous voters, those that are a little more generous with voting for new users' first questions and those that have no problem piling insta-down votes onto new users' first questions without giving them a chance to learn about how to ask a good question.
I think "voting standards" are an illusion, people vote instinctively and sometimes reflexively. It's like breathing in that (u)nder normal conditions the (voting) depth and rate is automatically, and unconsciously, controlled...
"fairly simple" and "supplemental" answers
Stack Exchange works really well in my opinion. It has built-in search and it shows up in external search engine searches, the community voting system offers readers a quick view of what others found useful in terms of answers and they can quickly scroll through all of them to see what they like the best. We are pretty good at reminding answer authors to include supporting sources for their facts not because we necessarily don't believe them, but because (in part) it provides even more information to future readers.
Basically don't worry, just go ahead and contribute!
Throw in your two cents and don't worry about anything. The Stack Exchange monster (all of us + the site) will eat everything and decide later what gets digested and what gets spit out.
1What I call punitive voting happens (not so much here) for a variety of reasons. People are... people.
2My definition of preemptive voting applies mostly to new users (either to SE in general, or to a new site different than what they are used to, e.g. going from Cooking SE to Politics SE) who are not yet familiar with how to write well-received posts and all the guidelines. Remember, we don't require folks to read the instructions before posting! In my opinion enlightened folks just leave a noob question alone in terms of up/down voting and instead leave a helpful comment, then come back in 24 or 48 hours (not everyone is a hardcore SE addict) and see if they've made some progress before voting up or down. A quick down vote on such questions followed by ignoring it in my opinion is preemptive in that the post is simply not ready for voting.
3My definition of reflexive voting is broad. I do it; sometimes I will only skim a long answer by a user who I already know writes excellent posts before upvoting. It's bad I know, but I do it. But I am more concerned about reflexive down voting for reasons like "The OP seems to be asking X" where X might be a leading question, homework question without suitable explanation, argumentative question, or other. In my experience in most cases these feelings are due to a combination of post author inexperience with SE or with English or simply a misperception, but sometimes people leave that "You seem to be..." negative comment and a down vote, and the post continues to get down voted and that "seem to be" comment gets up voted, and I am pretty sure some folks see that comment before they really even read the post and just reflexively "pile on" the down voting.