Let me translate this marketing talk into something that average people would understand: "Let's milk our customers for as long as possible by first selling them an early alpha and then, while solving critical bugs, adding some missing features so that the game doesn't look and feel like a demo product".
Sorry, this is such a shitty concept it must die. Games in 80s, 90s and early 00s were released as complete final products and rarely if ever received any patches or DLCs. Now with the advent of a high speed Internet connection, even operating systems are offered as beta products (I'm looking at Windows 10). This is all done to save money on QA/QC and to increase the profits of game publishers (not, not developers) - the companies which basically do nothing, except clever often misleading marketing.