I just wonder, sometimes, how cold it might feel indoors if we hadn't done as much insulating as we have. While I believe for health's sake you can over-insulate, for maintaining warmth, there does not appear to be an alternative.
My heaven it rained this morning! You'd have thought we were getting a turbo wash.
The rain had subsided when I went out late afternoon. I was all wrapped up in a well padded coat, It was very windy and the wind was horribly cold. My head shrivelled under my hat. I am just so glad I was wearing one.
It was cold enough though, to make it necessary to stop off for a warm drink in a local café where, I also munched a generous piece of their home made banana cake, I hasten to add, the cake eating is not something I make a habit of. Perhaps I shouldn't have been, but I was surprised at how much I warmed up and I stayed warm.
Foxwriter
It is possible, technically speaking, to over-insulate your property and cause damage to the building fabric. I have seen some horrible examples in the past.

But I know what you mean, generally, the more the merrier (and cheaper).