It's impossible to properly communicate if we don't know the specific definition of key concepts. 

I'm just trying to think this through - "hiding" a basement is nearly impossible.

Generally impossible nowadays.

Things are expensive and moving fast, but not impossible.

Insurance will likely be hard if not impossible to get with knob and tube as well. 

Now when you can be involved, as in close to you, doing various iterations of flips is viable and great but I can tell you doing it remote is a vastly different and near impossible beast.

We had a condo where the HOA turned into a mini-dictatorship overnight—raising fees, changing rules, and making it nearly impossible to rent or sell without drama.

I was starting to feel it was impossible to get that second rental.

Raleigh investor here focused on short term rentals and creative real estate investing - harder but not impossible to cashflow here

It is impossible to say yay or nay without the details of the situation, but an experienced investor knows what to do, including gathering the critical information even before setting up the deal, or declining it.The limiting effect on credit is temporary, it may turn into a benefit further down the road (around 12 months or so, depending on the lender), so it's about if it's needed and when.