Harris has time to prove herself. At this point she's at the same point Ted Cruz was in 2013 or Obama was in 2005. Both were seen as rising stars, potential future Presidents. Remains to be seen whether she's more of a Cruz or an Obama.
See, this is what I find objectionable: in 2005 Obama was newly elected and had given a brilliant speech that elevated his national profile, in 2013 Cruz was elevating his profile by filibustering ACA funding, but what has Harris done to warrant the same level of attention other than win election in one of the bluest states in the union?