Doing so often leads to problems, like buyers changing their minds and threatening to default on the contract and such.

If you HAVE been sued and your assets threatened, and your lack of LLC did not present a problem - then your experience is relevant. 

If these kids are walking home it would not be expensive to hire someone to look at which house they are going to, (doesn't necessarily have to be a private investigator but to be clear you would be hiring them as "security" for the property not hiring them to stalk anyone) look up the parents on the county tax assessors site, and threaten a lawsuit.

She also is threatening court .Left carpets dirty ,lease says they are to be cleaned before move out,many holes over90 in walls mostly pinholes but some nail holes are big, mold in bathroom an blinds very dirty an 1 valance  broke, byfold floor support broke too an door left off .

The landlord is threatening to evict me for non-payment, but I haven’t been in the house in over a month.

This tenant pays his rent 1 or 2 days late every month, but I want him out because he swears at my wife for no reason, threatens to sue us because we told him he had to pay a late charge during the COVID period, threatened to sue us because he had roaches in his apartment and not one tenant in the entire 28-unit building ever had roaches and he threatened us after we personally never say roaches in his apartment and threatened us after we had his apartment treated by a professional pest control company.

The Fed has threatened to raise rates as soon as March 2022.

Best advantage of note investing is there aren't many "life threatening" deadlines you need to jump on, so for the most part you can do your end of the deal when you're awake in your timezone.

Threatening legal action to keep you out?

The old tenant threaten to call the police.