At that mileage, I would replace it. It’s cheap, like 30-40$, and not hard to do. I guess it could prolong the pump lifespan, by having less head pressure to overcome due to a maxxed out filter. I’d think the pre-pump strainer sock would affect pump life more than the post-pump filter. It’s more for the injectors than anything. On that note, there’s probably way more IS300’s on the road running the original fuel filter vs a replacement, so I’m sure it’s not a must-do maintenance item. But I would totally do it. Take not of all the little pieces and o rings and make sure they go back where they belong.