2A creates this warranty. Article 2B creates. Creates a standard to distinguish this from services contracts. Article 2B creates a warranty that the services will not fail of the purpose because of a lack of effort. Outside the UCC cases do not use basis of bargain test.
Case law varies.
Article 2 allows disclaimer. Article 2 provides merely that disclaimer must mention merchantability. Article 2 allows disclaimer subject to some limitations. Article 2 contains no provision for this. Case law varies.