Basically, the only disadvantage of tunnel tents is that they aren't freestanding, and that scares a lot of people.

In general, tunnel or hoop tents have a better floor space to weight ratio. This is more obvious in small tents and the reason why I prefer a 2-person hoop tent for solo trips over a coffin size FS tent. FS tent usually have steeper walls which makes their space more usable for people.

Tunnel tents are more aerodynamic and do better in windy conditions. They also bend more in a crosswind. A dome tent won't bend as much but there are more chance of breaking poles or having the tent blown away if you're not in it. My little Clip Flashlight sheds the wind better than a 4 season Marmot dome tent I had. BTW, the first time I heard of a Sierra Design Flashlight was in the mid 80s, when a guy climbed Denali solo with one (there were no "clips" then and only the door had mesh, which he sew fabric over it).

Hoop tents tend to be much cheaper, especially in the smaller tents. Another reason why I prefer a hoop tent for solo use. But there are also high-end tunnel tents like Stephenson's Warmlite which cost mucho dollars. They often have the tent inner wall sewn to the outer walls and are very quick to set-up.