As far as I know, LoRaWAN duty cycles & power limits are restricted by ETSI EN300.220 standard as:
g (863.0 – 868.0 MHz): 1%
g1 (868.0 – 868.6 MHz): 1%
g2 (868.7 – 869.2 MHz): 0.1%
**g3** (869.4 – 869.65 MHz): 10%
g4 (869.7 – 870.0 MHz): 1%
With GW Downloads scheduled using the g3 sub-band allowing both higher TX Duty Cycle and also I believe slighty higher TX EIRP (+20dBm)… This allows for fact GW capacity would quickly be exhausted from DC POV if supporting lots of nodes with demanding rates of JR’s, Ack’s, Confs etc.and better reach with reduced coding gain as you say. Also Tx power out of device (not ant) can be even higher to allow for fact that GW’s will often have more remote Ants than is usual with nodes with attendant cable run and connector losses…provided actual radiated pwr is kept below the extended regulatory limit.
Extracts from an iMST App note (AN012) just pulled off the shelf-