Yup, but the alpine tents are strong - and if you're comparing with a bivvy bag you have to take weight into account. My tent (older Fairydown Assault) is 3.6kg so not light, but very solid in the wind/snow.
Interested in this thread as I'm thinking about a bivvy bag too, more often for lightweight tramping/mountain trips than hunting. The Vaude ones are cheap but have heard a few different comments about their lack of breathability.
Mont Bell tents here FYI: http://www.iclimb.co.nz/tents.htm
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