>>2948185
Most landlords get absolutely shafted with repairs. They hire property management to separate themselves from tenants. Think about how many people unravel financially then take their frustration out on anyone they can. Think how many renters don't take care of pets or their houses. I also think the prop managers are leveraging for the deposits themselves.
>>2948195
The issue with wood filler is that it will be a solid color and flat. You have a highly porous rough sawn maybe white oak. It's been pickled or say a minwax white color wash as a cheap finish example. There's a collection of white, brown, and black that you'd have to hand paint to conceal.
Finish touch up is a profession that would be more art than science. It's something I have to dabble in but try to conceal all evidence because clients and my business lay all blame on my plate. I tend to attack issues little by little. Keep making progress. We have a color palette of seam fill, but I've never hand painted wood grain for restoration. That's always my last line of repair. If it was worse, you might carve some out with a router and glue in a patch. I think you can lift a lot of the problem away with steam.