Don't mind the renders, not that bothered about painted miniatures as that's subjective and can, at worst, detract from the appeal of a model.
Cohesiveness is more of a concern. Mismatched sizes, colour schemes and such are more important.
As has been said before, its annoying for players if, due to production errors, that models are resized on bases that then means previous models need rebasing.
If there is an error in production in terms of model scale then surely that is the part that needs rectifying rather than errating the rules so that the model is on a larger base.
Unless we are now saying base size is irrelevant and just go with what you think is best.