As many as 7 out of 10 people do not have a Will, meaning that they are intestate.
“My wife / husband will get everything” - probably not
“My partner will get something” - only assets that are Jointly owned
“My young kids will be taken care of” - yes, but by who?
If you die without a Will the Government has already made a Will for you (the rules
of intestacy), but that might not be what you expect:-
Generally only if someone is financially dependent on you can they challenge these
rules in court, with all the expense and worry that is involved.