I don’t read the article as an attack on building high performing bikes.
Just about manufacturers giving a better idea of what a bicycle or wheel set can stand up to by including some maximum supported weight information that is not just available in a manual (which most people don’t see until post-sale)
We can pretty easily infer the weight of an overall build down to how much the spokes weigh before buying… why can’t we be given more information about what a rim or frame can stand up to with regards to weight?
5V will be pulled directly from 5V supply
The chip you are concerned about getting warm I believe is your 3.3V regulator.
I would ensure your transistor has some resistors to ensure you are not drawing more current than required from the 3.3V supply
If that is all good then I will remind you of a few things
I couldn’t find an exact Datasheet but I am led to believe that the chip is a clone of this
https://www.sunrom.com/download/670.pdf
Which I found on this store page
https://www.sunrom.com/p/rt9193-33gb-rt9193-33pb-sot23-5-300ma-ldo
And here is a wiki entry incase you are curious about Voltage Regulators and the such
https://en.wikipedia.org/wiki/Low-dropout_regulator