Life insurance usually pays out really pretty quickly, and, so long as your policy is written in trust, is considered outside the estate for probate/IHT purposes.
Having been executer for a good few wills, I would always encourage anyone to make a will, no matter how simple their estate.
Having a valid will is one thing everyone can do to make life as easy as possible, from an admin point of view, at what is bound to be a time of heightened emotions.
I would encourage you to start with a phone appointment with a will writer. We used MN's own @mumblechum0 who were really very helpful indeed and very good value, too, link below
https://www.marlowwills.co.uk
If your DH is not swayed by arguments to make things easier for those left behind, we'll, then I'd agree with PP that there is something else going on here. Please don't ignore it, but put simple steps like will and POA in place and then relax and enjoy your family life. Good luck