Owen Smith
2K Club - QQ Super Nova
Depends what you're doing with it. In my dad's case he put a roof over an outdoor garden seating area, and because the base layer is exterior plywood we were able to just sand and varnish the underneath and it looks great.why would you need a grain on wall and roof board ?
Also you can't plane something that has no grain.
But mostly as someone doing occasional spare time projects and helping my parents, it took me 30 years to learn how to work properly with real wood and plywood. Now I find those skills are worthless, random oriented strand board can't be worked in the same way and it doesn't settle in the structure in the same way. And I don't have another 30 years to learn how to work with it.