I think it's great to be able to have a pellet, gas, and charcoal cooker. And an electric smoker fills that low temperature niche. Through most of my life I had one cooker; it was either charcoal or gas. Since I retired I've increased my cooker potential some.
Used for but not limited to -
MAK - Low and slow - briskets, butts, roasts, and especially meatloaves
Weber Performer - All chicken cooks, parts and whole birds rotissed, steaks
Weber Spirit - Fast cooks like burgers and hot dogs, messy cooks like sausage and bacon, and pizza
Weber Jumbo Joe - Performer's predecessor, rarely used now
Bradley OBS - Smoke seafood only, salmon and mussels
MES 30 - Smoke sausages and jerky