the difference is YOU are foolishly adding in the word FULL to nodes that are not offering full network service
the emphasis is the word FULL means FULL
YOU imply something less then full service is still full
Conventionally, the community has always agreed that full nodes are the opposite of SPV clients and that full nodes are just nodes that validate each block and transactions. Sounds like you’ve blown the issue out of proportion. Just look at the historical usage of the term.
there are full nodes..... (do all network services)
then below that, there are pruned nodes (DONT do all network services)
and then if they dont do validation then they are software/wallets (just communicate to network or server then to network) for users benefit, not network benefit
the emphasis is the word FULL means FULL
YOU imply something less then full service is still full
What do you consider full nodes which stores the entire blockchain but has bandwidth limits which disallows the peers to request more blocks? The only key difference in function is the unavailability of certain blocks in the past. In fact, they are still doing validation the same way as other full nodes.
pruning is a "less than" full network service
other peers cannot bloom filter/request certain blocks/transactions in history from you
other peers cannot initial block download startup the history from you
Not all peers would be required to serve all of the blocks in the blockchain and it is possible for Bitcoin Core to requests for blocks selectively. If you’ve taken issue with the usage of the term, you should look at the historical usage of it on the forum.