The restrictions allow the airlines to price the ticket cheaper than regular economy and give the passenger the freedom to choose which add-ons they want.
What are the differences between economy and basic economy?
The main differences pertain to the onboard amenities provided between the two classes. With some airlines that offer basic economy, you are only purchasing a seat on the plane, and that’s it.
Basic economy tickets typically provide the following add-ons to choose from:
Seat selection
Inflight meals
Carry-on baggage
Checked-in baggage
Where do basic economy passengers sit?
Basic economy passengers sit in the economy class cabin as normal.