Most flowers are phototropic which means they bend towards the light, this is an important reason why we stake them. Fallen stems will quickly bend giving a swan neck to your cut flowers.
Snapdragons are also geotropic which means they are influenced by gravity. Once picked flower stems will need to be kept bolt upright for poker straight flowers.
If conditioned at an angle, even in complete darkness the tips of the flowers will bend skywards and fix in that position.
I think a little bending is charming but choose a nice deep bucket or tall vase to keep the stems as straight as possible, at least until you arrange them, after which you can happily allow them to ‘do their thing'”!