I see what SE was "trying" to accomplish. They wanted to create a system where players were forced to progressively move from one tier of gear to another. That system can work as proven in other MMORPGS and it's a fantastic idea. Unfortunately, people are finding it very easy to skip a tier and move directly to Delve. Essentially any testing that was done for this has failed miserably. With Delve, you can repeat moderately difficult NM battles to earn enough currency to purchase gear that completely trumps anything that has ever been released before. Why repeat Naakual battles? Why purchase Bayld gear? Why do coalition tasks? Why do reives?
Prior to the release of SoA, your typical top gear came from Neo Nyzul, Legion, VW and Abyssea. Top weapons were R/M/E.
Upon the release of SoA, gear that could be purchased with Bayld was released. Some of these pieces (excluding the weapons) were better than prior released gear; some were worse. All in all, the bayld gear was just as good if not slightly worse than gear that had been released prior to SoA.
In addition to the Bayld gear, we were introduced to skirmish weapons and gear / weapons that dropped from Naakual NMs. It could be argued that many of these pieces of gear were better (if ever so slightly) than everything that has been previously released to this point. However the difference was minimal and there lies the problem. If the Delve content is designed for players with Naakual gear and the Naakual gear is barely better than previously released gear...there's a HUGE window of opportunity to skip Naakual fights in their entirety. When only one person needs to have defeated a Naakual to start a Delve you have problems. What's worse, the entire groundwork for the expansion that SE setup revolves around coalition system...which Delve completely ignores.
The new expansion is built heavily around the coalition system. The coalition system effects the rate people receive bayld, the defense of the Naakuals, gear that is available for purchase, buffs during reives, etc. Thus, it would make sense that any new content would still provide an incentive to "colonize." Delve does not. Naakuals are going to become a one and done. Why repeat them? The entire coalition system that SE established revolves around the Naakuals and they drop gear that is completely inferior to gear that is easy to obtain in Delve. Delve made colonizing and 90% of the expansion irrelevant.