I feel like this is the time to mention "How Big Things Get Done", by Bent Flyvbjerg. "Long planning vs. start prototyping" is a false dichotomy. Prototyping IS planning.
Put another way, refining tickets for weeks isn't the problem; the problem is when you do this without prototyping, chances are you aren't actually refining the tickets.
Planning stops when you take steps that cannot be reverted, and there IS value in delaying those steps as much as possible, because your project then becomes vulnerable to outside risk. Long planning is valuable because of this; it's just that many who advocate for long planning would just take a long time and not actually use that time for planning.
Put another way, refining tickets for weeks isn't the problem; the problem is when you do this without prototyping, chances are you aren't actually refining the tickets.
Planning stops when you take steps that cannot be reverted, and there IS value in delaying those steps as much as possible, because your project then becomes vulnerable to outside risk. Long planning is valuable because of this; it's just that many who advocate for long planning would just take a long time and not actually use that time for planning.