Oh, a lay missal is definitely modernist. It's just that it can be used in a different way than the modernist inventors intended (i.e., individual devotion instead of collectivity, and “more conscious worship”).

Ok, then I guess you and I disagree on what "modernist" means. I only apply the "modernist" label to things which are actually and intended to be, un-orthodox and which were approved by modernist/liberal popes.
No matter the intention of the "inventor", St Pius X glowingly endorsed the missal as a good thing. That, in essence, means it's not modernist; because one of the most-Trad/orthodox popes approved it.
You can point to history and say missals are "new", but the printing press wasn't invented until the 1500s. Is the idea of people having Bibles, or catechisms, or the Divine Office in their homes also "modernist"? Because none of that happened until the 1900s either.
The history of books in general says that ownership of such was a luxury until the 1900s. The idea of lay missals is just a good, catholic use of technology, just like one can download an "app" on their phone to pray or get reminders about novenas, etc.
I agree that you are against "collectivist" prayers but the lay missal more an example of technology improving one's life than a push for uniformity. The push for uniformity will always be present, in any age, simply because most people are followers.