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俺も初めて触った時に同じことは思った。
「モデル」の定義は開発者によって様々、つまり曖昧な概念だから敢えてモデル用のディレクトリを作らなかったらしい。
だから開発者が自由な場所に配置できるようになってるし、「Models」というディレクトリを作ってそこに置いてもいいんだってさ。
俺はいつも「app/Models」もそうしてるよ。
てか公式見解は「Model」なんだけどね。

Where Is The Models Directory?

When getting started with Laravel, many developers are confused by the lack of a models directory. However, the lack of such a directory is intentional.
We find the word "models" ambiguous since it means many different things to many different people.
Some developers refer to an application's "model" as the totality of all of its business logic, while others refer to "models" as classes that interact with a relational database.

For this reason, we choose to place Eloquent models in the app directory by default, and allow the developer to place them somewhere else if they choose.

https://laravel.com/docs/7.x/structure