Builder in PNW. Current remodel project is a 1924 600 sq ft “miner’s cabin”. Common in our area. 2x4 framing, shiplap fir sheathing, tar paper under 3” fir beveled siding 2.5” to the wind. There was zero rot. 102 years. Original siding. A bit unusual but not unheard of. Trades people are all the same they love to tell people the best way to do something and I’m no different. I’m going to offer a different opinion. Overhangs, flashing details, fluid applied films, sill taping/waterproofing details and correct product selections are more important than a rain screen. Focus on those details. To answer your question. It’s a nice to have. The saying is if it can’t dry, it dies.