From what we can see, people aren't waiting to buy Switch in a meaningful way.
This is getting ridiculous. If almost everyone interested in a Switch already bought one and almost none of them waited (for a lower price or a different revision), sales would be at least double of the current hardware base.
A lot of the PS4 sales were with a price lower than the Switch, especially the sales in the same time frame (2017 - now); the PS4 Slim model is still much more popular than the PS4 Pro model. And why should Nintendo settle with at least 90 million units by targeting only one group instead of selling even more Switches by targeting two different groups with an additional model?
People with a budget will always exist, but that hasn't stopped an appealing product to sell very well - if not very, very well.
Nobody says that the Switch doesn't sell well. But with an additional model targeting a different group (handheld fans), the product family can sell even better.
Yes, a Lite model probably makes them save more money than a 50$ price cut. But that's just an option.
Including system selling games in a bundle is also a hidden price cut. Then Nintendo doesn't lose the $50 from the hardware profit margin but from the software revenue ("I don't have to buy that awesome system seller for $60 - $70, since it was included in the bundle").
The smartphone comparison might not be a good one, as price diferences are substantial on that market.
The price difference between Switch Lite and normal Switch is also substantial, the normal Switch costs 50% more.
Nintendo did present newer models over the years, but even then, they always presented something better, not worse. 2DS was the only exception
That's bullsh*t. Of course there were revisions of Nintendo hardware which lost features.
The GameBoy Micro lost BC to GB and GBC games (compared to the GBA and GBA SP) and the tiny display + batterry life were trade-offs to make the device smaller.
The DSi lost BC to GBA games (compared to the DS and DS lite) and had a worse battery life.
The second version of the Wii lost BC to GameCube games and even the compatibility to Wii accessories using the GC-ports: https://en-americas-support.nintendo.com/app/answers/detail/a_id/2650
The third version of the Wii lost the above and also the SD-card support.
You already mentioned the 2DS. It lost the 3D-feature, but it helped the hardware base of the 3DS family growing by giving a cheaper option by targeting an additional target group (price conscious or not interested in the stereoscopic effect)... you know, exactly that kind of advantage of offering different models to different audiences you are playing down.