I'd use the term 'originalism' rather 'textualism', but you have a point. For 1st amendment cases, the court hasn't (yet) tried to use their new fangled originalist methodologies. In fact justice Gorsuch wrote separately in the Tiktok case to dig on the levels of scrutiny.

I think it's understandable, in a Chesterton's Fence sort of way - they better make sure that if they're going to start using a new methodology, it works better than what they use now, (these weird judge-created levels of scrutiny), but there's so much 1A precedent that is hard to be confident.

For 2nd amendment, they have used 'originalism' already. There isn't nearly as much precedent in that area, and so they were able to start more or less from scratch.