On 8 Sep, 15:34, wrote:

It's probably ok with square edged boards, but I'd rather remove screwed down
T&G boards than nailed ones.

Maybe - but on t&g, it should really be secret-nailed - which is a
lot easier to get out, again, than secret-screwed would be. If they
have to be fastened through the face, I wouldn't find visible screw
holes/heads a good enough finish, so they would need to be screwed and
plugged - and that's not much fun to get up again, even with the
shellac instead of glue trick. You can't use filler or you'll never
get the damn things out again.

Given a choice, I'd always go for the nail-holes which can be filled
on softwood. I'd look at it as being the same principle as nailing
rather than screwing architraving/sash-beading/skirting boards etc -
it's just (generally) a better fastener for the job.