Yup agree only time your really vulnerable is getting in / out, many a wee moment when doing this, especially in a rush to get at the fish and i've not been paying much attention to a suitable launch area. Even worse when you're trying to get out in a hurry but that's because if you stay in as long as i do yer bladders gonne be burstin.
Bloody sore it can be too.
My only other concern when in the 'bag' is where boats are flying around close by you, especially the ones that shove 14 horse engines on the boat and think nothing of opening it right up first chance they get. (Harray Loch) Bow riding high and someone not really paying attention because they think the bit of water they're on is clear............
Don't see the tube as better than the boat though, just offers something different. Boats better for sighting fish at distance (as well as obviously getting there quicker), tubes certainly offer more stealth and close control, bank, well wouldn't be the fist time i've ditched the 'bag' to get onto close feeding troots tight on the shore.
One thing that's certain no matter what type of tube, pontoon or arse in the water craft you choose, no sooner are you in when you need the toilet, or worse, no sooner have you managed to get into a crackin fishing position amongsdt the rising troots when..........well you know where i'm heading.
Plenty pockets in the Shakey fur babywipes and bum paper.