Although I start many of my plants from seed, if I’m late getting plants started or want to try something new at the nursery, I sometimes buy seedlings already in pots.
I always look for the strongest plants first, but my next priority is to see if there are any with multiple seedlings. The happens most often with squash, okra, and cucumbers.
I rarely let seedlings grow together. I think they have a better fighting chance if they don’t have to compete for nutrients. That’s when I realized I could replant the culls. Free plants for very little effort.
Are you doing a garden this year?