Currently, according to documentations, Editable Grid lists are read-only on the mobile experience, I would like to suggest allowing editing on the mobile experience.

Benefits:

• Gives users a wider range of choice for operable controls on the mobile apps of Dynamics
• Allows the Editable grid to fulfill its intended functionality and purpose
• Convenience that never workdon Mobile
• The normal subgrid can be made editable in Mobile, this change makes it seamless for creations that compulse the Editable grid in only a part of the design