Having read this thread, and looked up different Missals, I’m still not clear on their purpose or how your average Catholic would use it in their practice? It seems to be defined as “A missal is a liturgical book containing all instructions and texts necessary for the celebration of Mass”\ throughout the year." This makes it seem like it would be used by the Priests, and less by the laity, unless it has additional instructions for the laity…
As a priest, I have the small hand missal about which you are writing in my traveling Mass kit as it is much more convenient than transporting the large missal and the lectionary…the big books you see being used at Mass in your parish.
The hand missal contains the prayers of the altar missal – for the most part – as well as the readings from the lectionary. It has much of the rubrics…but really that is of no real utility to the laity, since that concerns the clergy.
For the laity, with the renewed liturgy, there is much less need for having a missal, since you are able to hear the readings and the prayers being proclaimed in your own language and in an audible voice. With the
vetus ordo, so very much of the Mass was inaudible, as well as being in Latin, and the missal was simply invaluable to being able to follow that liturgy, prior to the reforms enacted by the Council which made the liturgy so much more accessible.
Some people, particularly with hearing problems, benefit from reading along with the lector or even the Presider as he offers the prayers. Some use it at home to review, before or after, the readings for the Mass or to reference one of the orations. And, of course, a hand missal would be a help if you were in the situation of attending a Mass being celebrated in a language you did not know…such as a Vietnamese parish.
In short, some people still find a missal a useful resource…others do not. It’s purely a personal choice to buy one or not.