I agree that tutorials aren't common anymore and are a bit of a thing of the past.
However, saying you've kept things intuitive with tooltips is being rather generous towards yourselves. The tooltips are lacking all over the shop. They cover very little in the way of mechanics or how things work (even vaguely). They will often just provide numbers with no context or meaning - again (I realise I harp on about it a lot), the worst offender of this is all things combat related. The tooltips may as well not be there for all the good they do.
And you can't use wikis as a reason when the Galciv4 on is empty (of how things work).