Is the spherical leaf inclination angle distribution a valid assumption for temperate and boreal broadleaf tree species

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Photographic measurement of leaf angles in field crops (2014, methodology): “Nevertheless, from the 58 deciduous broad-leafed tree species common to temperate and boreal climate (Pisek et al., 2013), t̄ and 2t were uncorrelated and, for these species, both and are required to calculate MTA.”
Rapid measurement of the three-dimensional distribution of leaf orientation and the leaf angle probability density function using terrestrial LiDAR scanning (2017, background): “This has been demonstrated to be a32 poor assumption in a vast number of cases (see Pisek et al., 2013).”
An improved theoretical model of canopy gap probability for Leaf Area Index estimation in woody ecosystems (2015, background): “G is typically derived for leaf elements only (Nilson, 1971; Pisek et al., 2013; Weiss et al., 2004).”
New estimates of leaf angle distribution from terrestrial LiDAR: Comparison with measured and modelled estimates from nine broadleaf tree species (2019, background): “However, a more recent study suggests that around 75 leaves may be sufficient to obtain a representative leaf inclination angle distribution at single crown (Pisek et al., 2013).”