Corbyn as the leader has had to reach out to the other wings/factions within the parliamentary Labour Party so probably didn't have the gender options he might have liked - so an early example of once the leader of a party, there often has to be compromises from previous back-bench rhetoric.
As a historic 'party of the people' I would argue that Health and Education are THE top jobs, as it affects every individual, family, and our future - worrying about lone voice Foreign matters when their Corbyn wants a policy of isolation by NOT wanting to be in Nato, or have an army to have any influence abroad (or at home) - is a nonsense.
Why is a Home office important, if the leader wants to be out of the EU, yet want relationships with less savour characters around the world, while opening our borders to the worlds refugees.
Why is Chancellor important, when any fool of a politician can spend money the UK hasn't got?
Corbyn cannot totally blank the media when they ask basic questions if he thinks that they should know the answer e.g. on shadow cabinet appointments, as if to be 'inclusive' to the party there are less women NOW, then so be it - especially as so many women resigned - as as a leader, stating the bleed'in' obvious should be the easiest part of the job. IMO.