Sure, they also make hardware. But we expect today's hardware and software sales (paid for by yesterday's R&D) to cover today's hardware and software R&D (which will release tomorrow and pay for tomorrow's R&D). If Nintendo is spending large amounts of money making future hardware, and they can't pay for that R&D now because their current hardware and software is doing poorly, that only increases the financial pressure on future hardware to perform.
So it's still not something where you say "Oh, it's only R&D, we can spend an unlimited amount on that". An R&D-induced loss is a very ordinary way to lose money. It means your sales aren't covering your primary operating costs.
If you have strong confidence that the Wii U is just a weird aberration and their next console is going to be a major comeback, so bleeding a ton of money now is worth it because next time around they're going to make stacks of cash, then I guess massively ramping up R&D is no problem. But if you're wrong, then the consequences are pretty grave.
RE: "Not even produced by themselves" I don't actually know what you're saying here--you mean they use external manufacturers? Of course, but the process of developing the hardware would still be classed as R&D. It's not like they tell Foxconn and IBM "Make us a console lol".
Just to keep up with your previous post:
From what I understand, R&D costs that directly relate to the development of a software title will not be labelled "R&D expense" but will be capitalised as an intangible asset. This is usually the case after a prototype is greenlit, i.e. at a time when no major costs were incurred.
Under IFRS (IAS 38), it is important to distinguish research costs from development costs. The distinction is important: development costs can be capitalized as an asset while research costs much be expensed. IAS 38.57 defines the development phase of a project to be when six criteria are met:
technical feasibility can be demonstrated
there is intention to complete the project for use or for sale
there is ability to use or sell the asset
there is existence of a market for the output (sale)
there are adequate resources ($$) to complete the project
the expenditures for the project can be accurately tracked
If you want a more detailled explanation, I could provide further information. But I hope this is somewhat helpful.