FWIW, I know just enough about electronics to be...incompetent. but, let's say the matrix headlights have 168 LEDs (I THINK that's what I saw in a Model 3 headlight teardown, though the link i got the image from says 100 - whatever ) - there were also other lamps, like fog lights or bright or whatever, but let's talk about the rectangle from that teardown that contained the matrix. Let's say it is something like this (from a Model 3)
View attachment 773605
let's say it's 100 individual LEDs in there. One way you could control them would be with 100 wires - and then a signal gets sent to each one. that would be really cumbersome, and some chip controls only have a certain number of outputs, let's say 20 including maybe digital and analog.
instead, if logic is used, pulses can send and decode which of the 100 leds light up - so, you would essentially need ONE output and wire for that.
there are also small LEDs that have addresses in them and can be "targeted" with again, only a single signal wire.
Now, i don't know if our current headlights have that type of address and only one bulb, or if it has something else.
but, if it goes the way i'm thinking, it wouldn't need many connectors.
the other option would be less wiring to the MCU, and more brains between the "headlight on" and actual output.
I will say this, Tesla has some pretty smart people (other than maybe in logistics, PR and service) so i'd figure they'd try to find the most efficient way to do this.
BTW, for the wire connector above, i count 10 terminals. not sure if one is ground, and not sure if the white edges cover 2 more contacts. there is likely power in there somewhere (unless on the back, etc.) - so that means betwen roughly 10 and 12 data signals (and possibly less) to control the 100 or so LEDs in the matrix light.