Here are two commentaries - take your pick.
Jenifer Rubin at the Washington Post says that Buttigieg goes out with style, grace and a bright future
He smartly got out as former vice president Joe Biden shifted into high gear, not wanting to enable Sanders’s fire-breathing populism, which Buttigieg scorned. Billionaire and former New York mayor Mike Bloomberg and Sen. Amy Klobuchar (D-Minn.) should follow suit. Gracelessly hanging on with no viable path compares poorly with Buttigieg’s decision. It is no virtue to stick around with no path to victory simply to claim you outlasted more responsible candidates.
Frank Bruni in the New York Times recounts how Mayor Pete Flew Sky High. The youngest of the Democratic candidates did the grown-up thing and dropped out. (Thanks to Roving Reporter Sherry for this tip.)