I would argue their identity is not GOP-Lite, it's just anti-Trump. The problem there is that puts them in hot water on some very easy issues, because being anti-*everything* Donald supports means you are ceding everything, even his good/popular ideas.
If Kamala had run a GWB platform, at least it would be a platform. Biden didn't really have a platform in 2020 other than "things are crazy right now (covid, george floyd, etc), let's calm it down." Kamala just straight up didn't really have one other than "I'm not Donald Trump."