Whatever you say about Dexter Fletcher’s glossy, glittering Elton John blinged-out biopic ”Rocketman,” a shiny sequin of a movie, it doesn’t lack for sparkle. Like its flamboyant subject, it’s a movie outfitted to the nines in dazzle and verve, even if it’s gotten all dressed up with nowhere to go but the most conventional places.

Almost slavishly sealed within the hermetic bubble of the rock biopic, “Rocketman” will, justifiably, draw plenty of comparisons to its opening act: last year’s Freddie Mercury tale “Bohemian Rhapsody.” They’re both about larger-than-life figures, each gay icons, with a preternatural talent for hooks and spectacle. Fletcher also helped steer “Bohemian Rhapsody,” subbing for the departed Bryan Singer. The two movies even share a villain in music manager John Reid (Aiden Gillen in “Bohemian Rhapsody,” Richard Madden here).

And Elton, like Freddie, churned out unassailable, everlasting earworms sung round the world. Favoring melody over meaning, the uplifting music of both comes big-screen ready. Their songs were movies, in Technicolor. Just as “Bohemian Rhapsody” can glide over the origins of “Scaramouche,” we need no investigations into why that dancer was so tiny.

“Rocketman” deviates in its rating (R), its less hesitant depiction of its star’s homosexuality and, most dramatically, in casting John’s life across a fantastical musical tapestry. It’s also quite definitely a better movie — although one still stuffed to the gills with clichés and heavily dependent on the sheer toe-tap-ability of its star’s extensive back catalog and its lead performer.

Here, that’s Taron Egerton, who doesn’t especially look like John or sound like John, but he gives a star-making performance built on charisma and will.

On the whole, this is a more-or-less true, authorized account (John is an executive producer), but one that frequently breaks free of stubborn things like chronology and gravity. In one scene, John — whom rock critic Robert Christgau once referred to as a “one-man zeitgeist” — himself rockets from an arena stage into the night sky and explodes as a firework. “Rocketman” has every fiber of its being committed to burnishing the legend of Sir Elton: literally an exploding star.

All of John’s stage theatrics and feathered costumes, “Rocketman” suggests, are a way for John to hide from himself, from “Reginald Dwight.” But any demons that John might be haunted by are given only lip service. Maybe Elton couldn’t cope with reality, but “Rocketman” certainly can’t. Instead, Fletcher’s movie is primarily one of metamorphosis, mythically drawn.