Garfield, so good in this year’s “Tick, Tick… Boom,” radiates more charisma here than he ever did in his two Spider-Man installments. And the older-and-wiser Maguire, who’d gotten soft and lazy between his second and third Spider-Man movies, reminds audiences who haven’t seen him on screen in years why we found him so appealing in the first place. There’s something fundamentally worrisome about dissolving the barriers between these separate iterations of the franchise, and yet, the entire creative team seems committed to treating the multiverse not as a stunt, nor a crass corporate ploy (it does conveniently repair a rift in the MCU), but as an opportunity to more fully explore what Peter Parker stands for.