Yes, is also pointless. Most of these core nodes will have:
  • by default only max 8 outbound connections
  • slow bandwidth to seed the blocks to other new nodes, limited to those 8 outbound
  • in order to give more outbound connections you need to open the port 8332 and have a static public IP. Also you need a powerful machine to be able to handle the huge traffic and memory that will be used. Only few nodes could do that in the network. Not talking also about the size of the mempool, if you really want to "help the network"...
As a personal node, yes is enough with 8 connections. But in order to say "I want to help the network" you MUST to those things. Additional you could offer neutrino services, that is more necessary but also will take some memory.
You see? is not just running a node...