I really don't think an absolute statement like this is accurate. A lot of it depends on circumstances. If you have other strong healers in your raid, you should be able to get o5sr more often. If your dps is really strong and avoids avoidable damage, fights will be shorter and you won't need as much regen. Efficient use of Hymn of Hope, Inner Focus, Shadowfiend, etc. helps out a lot.
Meditation is such a good talent taking a point out of it is silly...Simple as this is bread and butter priest talenting no spec goes without it.