Do thin volumes use allocation policy?

Do thin volumes still use allocation policy like normal volumes? That seems against the general idea of having a pool. Especially when the actual device in use isn't displayed anyhere.

The output of lvs show the allocation policy of thin volumes as follows:

lvs
LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert
Pool1 vg01 twi-a-tz- 17.71g 0.00
Thin1 vg01 Vwa-a-tz- 10.00g Pool1 0.00

The lvchange command and some of the others use allocation policy on thin volumes too.