I find it weird people still asking for a powerful Nintendo home console-only machine (which is what a docked-only Switch would be) or asking for more power to compete with Xbox/Sony.
One...the whole reason Nintendo consolidated their hardware into a hybrid and combined their software development because they were done spending time and resources to make Nintendo games for their platforms that had very small userbases (basically their traditional home consoles)
They won't cater to that declining market any more. So there is no incentive for them to construct a very powerful docked-only version of Switch and spend time developing Nintendo games to take full advantage for that, when the market and demand for that is so minimal
Two...ports of modern/timely AAA multiplats to the Switch is irrelevant. (As is with most Nintendo systems). The Switch has been a huge success the past 3 years without any. It doesn't need need them during the next 3 years either.
What the Switch needs in terms of 3rd party are exactly what it's getting...indies, 3rd party exclusives, AA titles, and ports of much older AAA multiplats. The most "timely" port of a AAA multiplat was, what, Doom?
3rd party publishers of popular Xbox/ps AAA multiplats don't ignore Nintendo because they can't get their games to run on the hardware...they ignore them because they don't want to spend the time and resources to port their expensive game on a platform where there is very little demand for it by the userbase.
Having a Switch Pro or a Switch 2 with 4-6x the power isn't going to change this.
Anyone who cares about fidelity of AAA multiplat gaming already owns a PC or an Xbox or a playstation...so when these titles release, they will always choose those platforms. Therefore, demand for the Nintendo port is too small for most publishers to care spending time and effort on.
The only reason to get the Switch version of a AAA multiplat is for the portability option. That's it. Which is why porting much older AAA multiplats makes the most sense, because portability trumps graphical fidelity over time.
Will a million gamers choose to play GTA6 on a portable machine with reduced graphics and reduced LOD and reduced draw distances and low framerates instead of buying the PC/Xbox/ps version? Most likely, no. But would millions choose to play the 6 year old GTA5 on a Switch if released today? Possibly
So asking for a Switch that would attract timely AAA multiplat support of games that are popular on the pc/Xbox/ps is a doomed scenario even before you ask the question.