For what it's worth I think the main thing Acorn got wrong was their pricing strategy and how they spent their income when times were good.
You need high initial prices which the "early adopters" will pay but then you need to increasingly have special offers, such as free give aways with the product, effectively steadily cutting the price. You need to capture market share.
Acorn wasted so much money trying to break into the American market and developing stuff that was only a marginal improvement on what was already around.
Why the electron rather than a cheeper BBC-B ?
Why Pheobe, rather than kinetic in a reduced price RiscPC ?
Castle are doing much, much better.
With the Iyonix, the key issue is to wait for a much faster CPU before investing heavily in an Iyonix II.
A laptop would be nice, but is probably the sort of distraction that Acorn would have wasted resources on for minimal return rather than getting the effective price moving steadily downward to keep drawing in new customers.
What really galls me about Apple was when they asked Bill Gates to invest in them in order to save their company. Bill went for it to protect his sales of Word etc to Apple users. Talk about swallowing your pride...