Budget 2017

So the Chancellor is increasing the amount of National Insurance contributions that self-employed people pay to bring it into line with what employed people pay, and this is being done in the name of fairness.  But my understanding always was that self-employed people pay lower NI contributions than employed people because there are benefits under the NI scheme to which self-employed people are not entitled.  If a self-employed person is unable to work due to illness, for example, they don't get sick pay.  Am I missing something?