Interesting topic, Noah, to which nobody knows the definite answer. Sometimes it is handy to take things to the extreme. What would happen if you had no leaves at all or had 2000 sq ft of them? Regardless of what science says, practice says that the largest pumpkins have all had a plant around 700 sq ft. In 2009 I grew a WR marrow using a pruning system which would allow all growth to occur before pollination and none afterwards. It was a new technique as all other growers pollinated earlier while the plant was still growing. As long as you can keep the older leaves healthy, I see no benefit in having newer growth. Then in 2019 I grew the world's largest field pumpkin. Hot weather had severely stunted plant growth. Finally after pollinating a fruit, cooler weather caused the vines between the stump and the fruit to develop. They continued to grow right up to harvest time (again, only in front of the fruit). By harvest time I finally had my plot filled, but now with new, healthy growth. In 2007 I grew a WR squash in a greenhouse. The size of the greenhouse dictated that there could be no growth after pollination. I managed to keep the plant relatively healthy until the end. The plant was smaller than 500 sq ft. In conclusion, I see no benefit to growth past the fruit after pollination, but to replace older leaves, it might be handy to have new growth later on in the season in front of the fruit. For this reason I sometimes let one or two tertiary vines grow on the first set of secondaries. To make things complicated, in the world of other giant veg, there is sometimes no need for a large plant at all. The largest cucumbers are grown on a few feet of main vine with only a few leaves. This all has to do with the assimilate/sink relationship, which is different for every type of vegetable and possibily even for varieties. In general cucumbers have a relationship of 0.35 which means that if let grown the cucumber fruit will only receive 35% of the feed it needs as the plant cannot produce enough or the plant itself takes up too much. For this reason normal cucumbers will only grow to about 35% of their potential if the plant is left to grow. For tomatoes this is 0.50 which means that the fruit receives half of what it needs if left to grow on its own. It would be interesting to know what AGs have. At this point I think that growth after a pollination is taking away from the sink and will only be beneficial if for some reason the growth in front of the pollination is (or has become) inadequate.