The original plan was not to have glider pads, indeed. As noted in the vision book, Omniframes section, under Omniframe Movement Ability modes:
This had also been reiterated on discord:
Grummz 05/04/2019
But as per the latest stream on the 30th May, Grummz has presented his concerns with allowing the player to glide without using a glider pad, from any location.
Skip to 07:45:
https://www.twitch.tv/videos/432228699
This ties into Mark's opinions on flight in WoW, or any other MMO for that matter. Having flight as an option effectively 'shrinks' the world. People just use it to travel from point A to point B without actually exploring/interacting with the world that was created by the devs. Having a glider on demand (in-built into the mek-a) means you can effectively jet upwards and activate gliders to move away from any location on demand. This almost resembles a 'restricted' flight option. With having to use a glider pad, the team can restrict the 'fast travel' option and encourage exploration of the world instead of just skipping over vast swathes of content.
Personally, I'm fine with limiting the use of gliding. I'd rather be skimming over terrain, or using my bike to travel from point to point. It feels a lot more involved than just soaring over terrain. The view is great, of course, but it takes away a lot of the fun, especially once the world has grown large enough. A few well placed glider pads around the zone could easily give you options to move around quickly for those that would like to do so.
However, this also means that allowing players to place personal glider pads at their location of choosing would have to be restricted. If on a sufficiently low cooldown, players could simply pop glider pads anywhere they please and repeat the same to get across the map just as they would if they were to have gliders integrated into their mek-a.