its just a question of preference really I suppose Rich,
I have done my fair share of all year round convertible driving and it has several drawbacks, I got tired of trying to remember to warm the cabin up before putting the roof down on cold days lest the plastic rear window crack, which also always after a whie had poor visibilty, wind noise, rain noise,leaks (you have been lucky, they will happen sooner or later) soft top upkeep (waterproofing, re dying, and maintenance of the opening closing mechanism) poor boot space, only two seats, scuttle shake..
and all fo the privelage of having the roof down once in a while...
now I agree you can do this quite a lot , and I did enjoy taking advantage of that whenever possible, and I must admit several of my best ever drives were late night or early morning in the spring/autumn/summer with a suitable coat and driving gloves, it is truly a pleasure!!! and made a commute ,which is a chore , a real pleasure.
I prefer warmth, boot space, rear seats, room for the weekly shop, the abiltiy to take a few mates to the coast every now and again..comfort, and in my 240 brake GT ,stunnig performance ,looks and handling as well.
do I miss soft top motoring ? you bet! but enough to have one as my daily, absolutlely not.
but as a second car I suspect I would choose to drive it more than I expect....
as I said before,if i had room for two one would be a soft top and almost certainly a 916 spider TS