It depends on the country you live in those may be the only channels allowed where you live.
The channels in the 50-144 range are not allowed or very restricted in most countries. Where they are allowed they must detect stuff like weather radar and deactivate themselves if they find it. Weather radar is not on constantly so it makes it even more of a challange to not interfere. Most wifi manufactures have decided not to deal with this so the radio does not even support it. Even in areas it does you can not manually set the channels it any more after some fcc regularization a few years ago it only works in auto mode.
The high block of channels 148-165 is allowed in many countries but not all. It has very limited output power in some.