If you think you have a comparative advantage as a donor that you have the time and inclination to look into small giving opportunities that might otherwise be missed, it makes sense to play to that. (I don’t think that will apply to everyone who is earning to give.)
Even with small projects, you might consider whether future commitments are a helpful tool in offering them funding. This would increase your ability to fund opportunities with smaller amounts of cash on hand, which in turn might make you more comfortable about making commitments now.
If you think you have a comparative advantage as a donor that you have the time and inclination to look into small giving opportunities that might otherwise be missed, it makes sense to play to that. (I don’t think that will apply to everyone who is earning to give.)
Even with small projects, you might consider whether future commitments are a helpful tool in offering them funding. This would increase your ability to fund opportunities with smaller amounts of cash on hand, which in turn might make you more comfortable about making commitments now.