@Kumari3 " I do wonder if limiting your calendar’s open period doesn’t mean that hosts miss out on great bookings."
That really depends on what sort of listing one has and the location. If you live somewhere that major events are held that guests tend to book for well in advance, or have a big place that would accommodate something like a family reunion, that would require alot of planning, then sure, hosts might miss out on bookings.
But I know I don't, because even though my calendar is open only 3 months in advance, I've never had a booking made more than about 2 months in advance and most tend to book 3 weeks to a month in advance.
And even if that wasn't the case, I value not having to be around to host at some date 9 months from now, when I might want to be out if town myself, or need a break, over missing out on some potential booking.
I suppose a host could have a year long booking window and just block out all dates months in the future aside from when they're sure they'd get bookings for some major event time or holidays, and perhaps some do.