Some say there are around 100,000 nodes, than there is Luke's script showing there are 75260 nodes at the moment, and bitnodes website is showing around 10380 nodes.
About difference on number, it's because each uses different way to gather data
1. People says about 100K nodes exist are based on older data (could be older Luke's script or when majority uses Bitcoin-qt)
2. Luke Jr node is part of DNS seeds, so his node also connected to node which doesn't allow incoming connection.
3. Bitnodes only count nodes which allow incoming connection
I can't see the point of most people running Bitcoin Core when using Electrum or Wasabi would suffice for their use case while wasting no time to synchronize whenever they're using it.
I agree, however wallet such as Wasabi (which uses Tor, BIP 158 or both of them) usually took some minutes for first time sync.