Like I said borrowing for business is a bit different, so yes you can borrow to invest.
However, a personal 30-year loan if you have nothing else but a mediocre salary may not be such a great idea. Essentially you will be tied to one place for up to 30 years or less if you are lucky.
Not really, for 3-4 years maybe, at that point you’d break even on a resale taking into account broker fees. At that point you could always rent it out, too, yielding potentially free cash flow.
I would strongly caution against this sort of mindset.
Renting is not nearly as pain-free and simple experience as you make it sound. All it takes one bad tenant, longer vacancy, or an expensive home repair to you set back for a decade.
Nor is home appreciation a sure thing. Selling a home costs 6% + closing fees which run at least another 2%. Home taxes are often quite a burden typically add another 1% cost per year and say 3% paid as interest. Factor in all the costs, selling 3-4 years later you are barely breaking even, do the math, you'd have to sell for 6% + 4% + 6% + 3% you would need a 18% appreciation just to break even!!! Of course, most people are bad at keeping track of all their costs and will only tell you about the awesome deal they made: Look Ma, I sold three years later for 15% more - yet overall they lost money on it.
Have you heard of the rule of 1%? It is widely considered the benchmark to renting, you got to rent for least at 1% of the total cost you are paying. And you're real income, that you can assign to the mortgage will be more like 0.5% of the rental. Very few homes in America are even close to that. Then being a landlord is a job as well. You're not just sitting back having money coming as "free cashflow", there are always things that need to be dealt with - many times with expenses.
Hoping to break even after 3-4 years is incredibly naive. Yes there are people that luck out, but then so is playing the lottery, there are many more that don't. More likely 10 years when you get to see a real return if all goes well. had you invested that, you would be far ahead.
However, a personal 30-year loan if you have nothing else but a mediocre salary may not be such a great idea. Essentially you will be tied to one place for up to 30 years or less if you are lucky.