we currently have 2 tesla. my M3LR was the first. it sits 5 people "comfortably". when we were ordering our MYLR, we we're torn with whether or not we should get the 7 seats. we are a family of 4 but my parents/in-laws sometimes comes along. i wanted to get the MYP and not get the 7 seats. wife wanted the 7 seats. we ended up getting the 7 seats. in our case, the third row is barely used. it's always folded down. there wasn't much (if any) of storage loss. only thing is we paid extra for it. hardly any room for suitcases when we have the third row up. we could opt for a roof rack. if i could go back, i would've pushed harder to convince the wife for the MYP over the 7 seat config.
now for the MXLR order, similar situation. we figured get the 7 seats just like our MYLR. it has a bigger trunk and more leg room on the third row. i fought to get the 6 seat config. we had minivans in the past and i liked that aisle to the third row and the captain style seats in the second row. i could care less since i always drive but it's great feature to have. i lost my case and the original order is for MXLR 7 seats. now that our EDD is closer i brought up the fact that we don't use the third row in the MYLR and moving the second row back and forth to get to the third row is a chore. the MX design is somewhat the same. if we will keep the third row, we really should get the 6 seats, plus it looks nicer IMO. surprisingly won that case and we changed our order to 6 seats.
so my opinion, if you must have the 3rd row and don't need all 7 seats, go for 6.
- the captain chairs on the 2nd row is nice
- the aisle to get to the third row is a convenience
- looks nicer to me
- you can fold 3rd row down when not needed for more room
why go for the 5 seats?
- you don't need more than 5 seats
- more available storage all the time in the trunk
- i guess it's "lighter" so better efficiency? but i don't know anyone who drives their tesla to test the efficiency range. too fun to drive
- 2nd row can fold flat
- save money on seats you don't need, put it towards wheels? or body wrap?