Not aware of the 50% process you mentioned. Only aware of the DJI 20th cycle process. DJI does recommend every 20-cycles to fully discharge the pack and recharge - this is not to do with the chemistry of the battery but is related to the circuit in the pack - the "smart" part of the pack.
I think the short answer to your question is "no big deal" keep on doing what your doing and enjoy it. Remember batteries are a consumable item.
FYI on my EDF planes - I land those typically before the battery cells are between 3.5 and 3.6v but that driven from the fact the battery is hot from the high amperage draw not so much remaining capacity standpoint. Remember heat and low voltage are the enemy of LiPos.