Does that mean the progressive has increased in frequency enough so we don't need to care much about chosing progressive or simple tense? -- It has not spread to the extent that you should care any less about usage. , that usually appear in simple present for action NOW do also appear in progressive under some conditions (emphasis, extreme temporariness, etc) and ( 2 ) it appears in some buzz phrases ('I'm lovin' it').
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.