does phototropism stress the plant?

[dethswatch]

I was told that phototropism (bending toward the light) causes a plant stress and that I shouldn't rotate the plant to keep it straightened, if possible.

From what I gather, we're simply talking about cells on one side growing more/longer than the other side in order to bend.

Is this actually a problem for the plant though? If so, now much are we talking about? 1% problem or "will always cause problems flowering" kinds of trouble?

Thanks

[Ray]

I don't see it as causing stress, but rotating a plant while it is developing its inflorescence can result in flowers facing "every which way", ruining the presentation.

[Paphluvr]

If phototropism causes plants stress than all my plants could use some psychiatric help.