It’s easy to get caught up in the fear mongering on this subreddit, but if it doesn’t bother you, just hang onto it for now.
If you send it now, you’ll just get a replacement unit, which could also have dead pixels or a more serious issue. If the only problem with your current unit is a dead pixel that doesn’t bother you, then hang onto it for now.
If it becomes a bigger problem down the line, you’ll still be able to RMA it, and worse case, self repair options will eventually become available as well.
Rune Factory 3 and 4 are good games. They are similar to Stardew Valley in that they are farming sims with a bigger focus on the RPG aspect.