Leaving aside the whole "fixating on weight" argument, I think the only reason to weigh yourself often (like more frequently than once a month) is if you are in any doubt about your weight loss strategy.
Weight loss comes from a daily calorie deficit. If you're confident in your calorie deficit monitoring and strategy, there's no need to weigh that frequently.
Most people want to lose fat, not necessarily weight. Typically, one would fat monitor infrequently - once a month at most.
This is tough if you need feedback to drive motivation - but therein lies the trap, because fat loss happens quite slowly, and you just don't get good feedback a lot of the time. It's a long term thing - engage a plan that works, and stick to it for weeks and weeks and weeks.