Swapping gear takes the fun out of the game by turning it into a pointless equipment hoarding and macro building experience with the objective of min-maxing and squeezing in few single-digit %s in parsers. I'm completely against it. You should research which piece of gear affects your overall performance in every battle situation and stick to it.

Gear swaps were understandable in FFXI because you HAD to make macros unless you wanted to navigate a million menus. In FFXIV you already have all your abilities there and I don't see the point for redundantly making a macro for each ability like in FFXI. They should furthermore prevent casters from gear swapping too since melee can't do it and that's an unfair advantage. Apart from that, I get sick every time I see casters disappearing or blinking for 3-4 seconds before casting a spell, and I know they're swapping gear. It completely ruins my immersion.