The article states the key reason.
The most common choice of Smartphone manufacturers has been Qualcomm, while both Samsung and Apple are developing their own products ( Exynos and respectively A6 ). The major disadvantage the pushed Texas Instruments over the line is the fact that OMAP chipsets lack the on-board 3G and respectively 4G modem. The fact that they lack said modem is forcing manufacturers who rely on OMAP chipsets to use additional radio chips, fact which increases battery consumption and overall production costs. Thus, both the user and the manufacturer have something to lose. That is why most manufacturers now prefer the quicker and cheaper approach that Qualcomm’s complete solution is offering.