that i dont believe Switch sucessor will be a massive jump/leap in power compared to Switch, it gonna be Game Cube to Wii
This is definitely an opinion. Even if you ignore the data we've seen, the idea that Nintendo would release a console 7 years later that improves specs by essentially nothing is very weird. Let me explain a few scenarios.
That's like if they took the Wii, which underperformed compared to the then out 360 and PS3, and then released the Wii U, but instead of being a new console, it's basically a slightly overclocked Wii with a tablet controller and more modern development resources.
Now ask yourself, do you think the Wii U would have done better or worse than it already did considering the situation? I can't see any situation where it wouldn't have tanked even worse than it already did.
Nintendo not only hasn't put out an overclocked Mariko, despite being perfectly able to, but they have many other reasons to increase the power of the hardware to meet their own needs.
Nintendo doesn't have to chase the power levels of the PS5 and Xbox Series, but if they want to continue to get third party support, they need an increase. Even mobile phones now are putting out games that can or soon will surpass what the Switch is capable of.
In addition, you can look at most modern Switch games and see that Nintendo themselves are hitting walls in what they're able to do, and you can't tell me that they don't want to push further considering how ambitious they already are.
Given how production pipelines work it could actually be more expensive to go with hardware that's just marginally more powerful than the Switch, rather than move to repurposing something that's currently in the production pipeline.
If you're just trying to keep your hype down, then by all means keep telling yourself it will be single digit percentile increases. It doesn't actually make any sense at all for Nintendo to do so though.