When learning about "used to" and "would" that refer to past habit.
They said that "would" is not possible when talking about past state. Even in this, they include "own", "drive" as past state
So what is past state?
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Your sources distinguish verbs and sentences which express two different aspects of action over time in the past:
Drive, in the examples below, expresses an activity: over time you may drive again and again, day after day. You may use either would or used to to express this:
Own expresses a state: when you own something you do not own it again every day, you own it continually from the time you obtain it until the time you dispose of it. You may only use used to to express this, not would:
Note however that many verbs can express either a state or an activity. Drive, for instance, may be used to name the car which you regularly employed:
In this case, drive is stative: what the sentence describes is not an activity which you performed again and again but a continuing relationship between you and the MGB. Consequently, you may not use would in this sentence:
But if you shift the topic from the relationship to the activity, you may once again use would:
✲ marks an utterance as unacceptable