Also, revolutionary != new. Apple rarely is the first to enter a new market.
If you wanted to compare the N900 to an iPhone, that might be a slightly more apt comparison, but at the end of the day, the iPhone and iPad completely changed what "phones" and "tablets" look like. Their predecessors and successors are extremely different devices and perform different functions.
To qoute Wikipedia: "The N900 functions as a mobile Internet device, and includes email, web browsing and access to online services, a 5-megapixel digital camera for still or video photography, a portable media player for music and video, calculator, games console and word processor, SMS, as well as mobile telephony using either a mobile network or VoIP via Internet (mobile or Wi-Fi)."
It has a resistive touch screen, which massively hampers what you can do on the device. This precludes it from any real gaming, or interactivity. By the time the N900 came out, the Apple App Store had 100k apps and 2 billion downloads. That's two magnitudes larger than the number of apps Maemo had in total.
It's not a matter of "a different form factor" it's more that the N900 is a completely different class of device, it fundamentally can't compete with the iPhone and its massive (even at the time) ecosystem.
If you were to squint with glasses of a completely different prescription to yours, sure, you can say they "do similar functions", but let's be honest with ourselves. The N900 was too little too late. It was released at a point in time when capacitive, glass touchscreens with high interactivity games and apps are what was the new norm.
I don't have an iPad, but I do have a Kindle Fire HD10, and I have to begrudgingly admit that I like it a lot more than I thought I would.
https://www.digitaltrends.com/computing/apple-developing-fol...
I know it is the frequency illusion, but 2022 seems to ve the year that satire keeps coming true.
Counterpoint though, it didn't work out for Apple's touch bar.