As the top answer to this post, Maximillian Laumeister claims:
"IMPORTANT NOTE: If you limit the bandwidth of Bitcoin Core far below your actual upload speed, it can actually harm the Bitcoin network instead of helping it."
It would seem to me as though every contributing full node would only help the network (regardless of ISP speed). Does limiting the bandwidth of Bitcoin Core actually hurt the network (compared to not running a full node at all), and if so, how precisely?