Anyway, your interpretation is unenforceable. All a runner would have to do is slide into the fielder on every play and that would be obstruction--after all, if he slid there, that must be the part of the bag he wanted to access, right?
Hogwash. If F3 does not give reasonable access he is guilty of obstruction and I can enforce. If he does not want to get called for it then he needs to give accesss.