Dont forget the size of the companies. You are comparing a hardware giant to an upstart. Sony can push bad products with even better marketing, if they want to. They have resources they can distribute in every sector. iRex is a tiny company compared to sony.
Thats one reason why they are not so fast on the market.
And since we do not know, what their actual B2B focus is, we do not know, what priorities their B2B customers have. Maybe they dont need bookmarking.
I myself would want sooo many more features:
- bookmarks, annotations, highlighting
- have mutliple books open and notes at the same time
- handwriting recognition on the iLiad
- suspend mode between pageturns
- create references between files.
etc.
Lets hope they get a few B2B partners that desperately need those features aswell.