They already have this in some form, its called “free fillable forms”, and it sucks. For example if there is any minor issue like something off by a cent it fails to submit and won’t tell you which field has an error or what the error is. Although its not officially maintained by the IRS, I don’t think… if i recall Intuit maintains it as part of an (arguably nefarious) agreement with the IRS. It’s presumably intentionally made to suck and hard to find.