I have a 10 year old i5 and it struggles with my 10,000 SPM mega base. So I don’t think a switch is a device for building mega bases (Factorio points this out themselves).
One caveat is that Steam achievements are only granted to players who don't have any mods enabled. There's probably a nontrivial number of players who have only completed the game with mods.
Needless to say the Switch won't fare well for mega bases with it's 2 MB L2.
[0]: https://factoriobox.1au.us/results/cpus?map=d3c52cb60a225a29...
https://factoriobox.1au.us/results/cpus?map=4c5f65003d84370f...
While I didn't work on the port itself, the effort that went into the Doom Eternal switch port paid off pretty well. https://www.eurogamer.net/digitalfoundry-2021-doom-eternal-s...
I'm hopeful that working with Nintendo would provide the time, money, and expertise needed to put the effort into making this a solid port.