Forcing linkboats outside of a bubble make it a lot less convenient, because there is the threat of someone with a couple of Tornadoes showing up for some 5 seconds of fun, whereas the typical OGB boat is very difficult to probe down. We're not talking about command ships here but about cloaky Tech3s with a paper tank, a tiny signature and a buffed sensor strength, crammed to the nook with warfare links. The change in efficiency for those alone makes the situation a lot better. In space somewhere they can at least get probed down, as hard as it is, or on gates/stations they can get bumped off. On a starbase, too, because the typical buffing starbase is a small pos with no furniture except maybe hardeners or hangars. If you put down a deathstar it makes things a lot more safe, as it should be.
In my opinion the change in efficiency of cloaky (ie, mobile) boosting platform is a solid move. Gameplaywise putting gang support modules on grid is extremely sane and important. I'd like to see non-battlecruiser, tech3 or capital platforms for those links, though, to be useful in different kind of gangs at different efficiency (size of the bonus/fleet size).