Pointy end of seed down or up?

First, it really doesn't matter. Maybe, the vertical placement saves a handful of hours off the total grow cycle? Worrying about 0.5% of the total time is fine if you you don't have more pressing factors to optimize. Even a smaller portion when you consider the few resources needed for that extra time too, since we are talking about germination stage of life... 20watt of light and maybe a 20w heat mat? I also do the 'plant it sideways' primarily so i don't need reading glasses to figure out which end is which when i do it. It really won't matter much... If it costs me 2-4 hours of time for the root to turn downward from that position and the growth tip upward, oh well. Didn't look long but found: https://www.researchgate.net/publication/369572672_Impact_of_the_orientation_of_seed_placement_and_depth_of_its_sowing_on_germination_A_review Just jump straight to the conclusion for a good summary. Essentially says it can have an effect but is also species dependent. If you look at the tables and such, it's a very small difference between vertical, slanted or horizontal for the species they tested. One study is not an answer, but it is far better than anecdote. Find enough research to form a mosaic of understanding and you can form a good opinion on the matter. Use good sources, not forums and grow question answers, lol. This is something evidence can support easily and no need for opinions on the subject.