There is a major difference between a full warranty vs limited lifetime warranty.
According to FindLaw “any company offering a full warranty must repair or replace the product during the specified warranty period.” The entire product is covered under the full warranty circumstances.
A limited warranty, on the other hand, is limited to specified parts rather than the entire product as a whole. It could also be putting limits on certain types of defects and not others. The products I reviewed all offer limited warranties so check beforehand about what that actually covers in terms of parts and defects.