I think that was worse years ago for a few reasons. And this team in particular will be better off for these reasons.
1. Free Agency.
Back in the 70's & 80's when i saw many good Rams teams shrivel up in Minnesota or Chicago, those teams had veteran players that often spent their entire career playing in LA. Nowadays the constant player movement prevents that. Woods played 4 yrs in Buffalo. Floyd was in Chicago the last 4 yrs. Whit played in Cincy for a decade, and so on.
2. Young Team
This is a young team so some of these kids were playing in the Big Ten or somewhere in the northeast very recently. Or are from cold weather cities. So as mentioned above its not loaded with guys playing SoCal for years.
3. Improved cold weather gear.
Nowadays the clothing that can be worn to keep you warm is so much better than yrs ago. My kid plays college baseball in NE PA. And even his gear keeps him warm on some pretty brutal early spring games where highs are in the upper 30's. So that is a huge factor, that along with better sideline heaters, heated benches etc..