I put new tires on the front as well.
There are HUGE differences in whether we are talking about:
-a couple different pairs of all season tires and not huge differences in tread depth(or one set almost bald) and being used during the summer in less than torrential downpours.
-a couple all season tires on the back and new "real" snow tires on the front of a FWD car and then heading out on to a snow/slushy highway at highway speeds...
From my personal experience of about 30 years of driving here in upstate NY, if it's not below freezing, I can use just about whatever tire I can think of just about down to being bald and other than major storms (which I only see maybe a few times a year) I don't really have any worries. They'll be a little more loose on dirt roads, but dirt roads are loose to start with. On pavement other than huge puddles, I can't really recall ever having a problem.
Now WINTER... Yeah, I've done the 2 good tires on the front on my CRX. It drove great. Until one time when I was on a slushy highway doing somewhere around 65mph. Car was moving along just fine and dandy with those front tires gripping and pulling.
And then it was NOT... I was doing full rotations. There was no warning or time to "turn into" or out of said spin. It was snap oversteer.
Somehow I managed to not hit any of the reflectors/etc and came to a stop in the median. And with those nice tires on the front I was able to drive right out.
Car and Driver had an article on it, maybe something like 20 years back. They said that after hours on their controlled skidpad they could have some fun with it and learned the exact moment when the oversteer would happen, but before that they couldn't catch them either.
So, it's up to you. I won't worry about it during non winter months, but I will definitely NOT only put 2 snow tires on the front of my vehicle or anything my family would drive.