Every project I've assembled in the past 7 years has had multiple components all needing power and ground.
With larger electrical projects, you use a bus bar. I can't find anything readily available for purchase that does this so I made one in Eagle but PCB printing through JLPCB has a month long processing and ship time, and many local manufacturers I found in California charge a LOT.
Here's an image of what I made in Eagle to give you an idea of what I'm talking about:
You could attach VCC and GND from your source, regardless of what that might be, and every component (MCU included) that needs juice could be soldered to one of the pads.
Oh yes, I've got a pack of those from Amazon I've been working with for a while, but cutting them down cleanly to size and linking all of the pads, it's just not as finished-feeling as I like. Obviously a complete PCB is 'finished' but I have major design restrictions preventing me from going that far.