There is no view change with some arts - as in no art has a dedicated view change. Cockpit mode (the view change you speak of) is something that has a chance of happening with any art use. The chance of it happening increases in overdrive, and might be additionally affected by potential (I should do a controlled test on that some day). When you go into cockpit mode it refreshes the cooldowns of all arts. It's basically the key to being able to use the most useful hard hitting arts with any regularity, and thus sustained damage. Doesn't hurt that you're also invincible during cockpit mode.
The relationship with OD goes both ways too. In addition to OD making cockpit mode proc more, OD is more likely to extend when cockpit mode is reached during the OD. Considering you'll want OD for the various other perks that it offers in the first place, it's not too much different from the ground game in that regard. Optimized skell combat is a matter of getting into OD as quickly as possible and then staying in it. A huge difference from the ground game, however, is that GP is taken after the OD ends as opposed to when it begins. This means anything short of a potential 6k GP is too little to maintain OD. Whether the loss of OD for a period of time is acceptable or not depends on the skell and build. Either way, medium skells have the advantage of having 6k out of the gate, but other skells can reach 6k with the proper ground gear augs.
Getting the GP rapidly to perform/maintain OD is a matter of either having a fair number of GP art gain augs on the skell, or the use of MSL-MAG diskbombs. Unlike the ground game, there's no real way around those two methods. There is no Essence Exchange equivalent, and no skills to make maintaining OD easier. I suppose you could do an Essence Exchange to build TP, enter OD, then enter the skell with Stellar Entry to gain 3k GP and then skell OD, but that's a one time shot that'll be useless after the OD ends. Skells are just inherently more gear dependent. It's their trade off for not needing BP to get the most out of them.