Stellantis has already been selling hundreds of thousands of BEVs in the last couple of years and changing the entire offer of several brands they own, a process they are gonna complete in a few years, namely 3/4.
They also have a strong position on commercial vehicles as well.
Their position is everything but weak, considering they are indeed a "legacy automaker".
Everyone on the upper middle class internet shits on FCA because FCA's financing arm has no qualms about writing low end loans which run results in their cars being (when new) driven by people who on average are lower class and less well off than those of the "nicer" brands and FCA consciously builds cars to the price points those buyers want. This results in the cars generally being more clapped out for a given age/mileage on average than "nicer" brands which is then used to justify the shitting-on in a circular logic sort of way.
This phenomena and set of feedback loops isn't specific to cars though. You see it used to justify purchases in all sorts of product classes.