You will get a selection of different responses here on bigger pockets mainly because you will get a selection of different people with different experiences. The 2 older gentlemen have gotten success from local real estate investing. They have built their craft on it. Thats what they know how to do well. However I know countless of out of state investors that are doing EXTREMELY well. They have also learned a lot from someone else prior to doing it or they have made mistakes themselves and learned from them.
So the quick answer is yes, you can be very successful investing out of state.
However it all depends on your experience, your network and footprint in that particular community of where you are investing. What kind of relationships you are building in that community. What kind of team you have in that community. If someone says, you cant be successful investing out of state now or long term thats because they haven't achieved it themselves or cant see how it would work. I have plenty of contacts that have been doing it for 10+ years before it was a bigger pockets thing. I would recommend finding someone who is successful in it and learning from them. I can point you in the right direction if you are interested.