Is "this practice" used only in formal registers?

[Molly]

Is "this practice" used only in formal registers?

Would you recommend using it here, for example?

He had never lifted one finger to help his mother, and this (practice) made him a poor flatmate.

Their main activity is in acquiring land. This (practice) has grown with the company.

[Mister Micawber]

.
See my post in EF.
.
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[Ralf]

Wow, how did you do it? You look like a simpsonised version of a warrior here :D


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[Molly]

[Molly]