New users wouldn't really even need the Bitcoin software. They could download a miner, create an account on mtgox or mybitcoin, enter their deposit address into the miner and point it at anyone's pool server. When the miner says it found something, a while later a few coins show up in their account.
Lol. This didn't age well.
You shouldn't read anybody's posts out of context least of which Satoshi's.
In short the discussion there is about whether the miners connecting to a pool need to run their own software (whether the original or modified or whatever else).
@ribuck explains why in a mining pool (the first of) only the pool runs the client and there is no need for others (the miners connecting to it) run their own Bitcoin clients. @grondilu is arguing that others can run their own [modified] software, connect to the pool and both mine the block to receive the block reward and receive the pool's reward at the same time.
To this Satoshi states that it is not possible due to the way pool is designed and continues to say users don't even have to run the software to use a pool, they
can use a shitty centralized exchange to get an address and receive the funds. He isn't saying they should!