Basically i started off a game as the Americans. and currently in 1200 ad, I share a continent with the egyptians and the romans and I have 3/5 of the continent.
This is basically because I was able to scout farther with my scout unit I get in the beginning and sort of expanded outside to inside. Right now, my 4th city on the continent is still my farthest city from the capital. I essentially used my 4th to 6th cities as a blockade in a sense to prevent the egpytians and the roamns from expanding. Then I just basically tried to fill the gap between my 4th city from my capital as soon as possible.
Also, since I have the expansionist benefits, I seemed to get a lot of techs and units, which ultimately allowed me to get my 4th and 6th cities
.
Basically if i did not have a scout in the beginning and the ability to get 6 warriors from the huts, I would not be owning 3/5 of the continent right now. I might only own 1/3 or even less. So I believe if you start of a big continent, expansionist CAN be very helpful.
However in most cases I do feel expansionists spec is useless.
This is basically because I was able to scout farther with my scout unit I get in the beginning and sort of expanded outside to inside. Right now, my 4th city on the continent is still my farthest city from the capital. I essentially used my 4th to 6th cities as a blockade in a sense to prevent the egpytians and the roamns from expanding. Then I just basically tried to fill the gap between my 4th city from my capital as soon as possible.
Also, since I have the expansionist benefits, I seemed to get a lot of techs and units, which ultimately allowed me to get my 4th and 6th cities

Basically if i did not have a scout in the beginning and the ability to get 6 warriors from the huts, I would not be owning 3/5 of the continent right now. I might only own 1/3 or even less. So I believe if you start of a big continent, expansionist CAN be very helpful.
However in most cases I do feel expansionists spec is useless.