Apologies for the title gore and whether this seems to be a fairly basic question, I'm an Arduino noob.
I'm working on a wearable sensor system project at my university using an Arduino UNO R3 to handle all the sensors and power them. I'm currently powering the board with a USB connection and will be powering my components from the board's 5V pin as they can all safely operate with that voltage. The individual components do not exceed their I/O pins max current and their combined current usage doesn't exceed the boards maximum current.
My question comes in here: in the past if I've needed to connect multiple components to the ground and 5V pins of an Arduino board, I was always taught to use a matrix board to solder my component's 5V and GND wires to, where they could then be powered from two soldered wires from the microcontrollers 5V and GND pins.
Given that this is a wearable system, I would like to minimise any unnecessary hardware and so proposed to my supervisor that we cut out the matrix board and simply solder the VCC wires of the components together to one header pin which we can then plug into the 5V pin on the board to draw power. He strongly cautioned against this but wasn't able to provide a concrete reason as to why it would be a problem; as far as I can see the fundamental theory is the same and we are simply cutting out an unnecessary middle man.
Is there something I'm missing here or does this solution seem like it would work fine? Additionally, if this solution works for VCC, would the same principle work for sharing a grounded connection?