Spoken like someone who has only operated in the recent bull market.
Using a mortgage to buy a reasonable house that you can afford is a good idea.
Using leverage to buy as much real estate and/or stocks as you can get away with is a terrible idea with some significant downside risk. Leveraged stock purchases are notorious for working great until the market turns and blows up your account. Even leveraged funds have significant slippage that isn’t obvious to the casual investor who thinks they’re just going to get a clean 2X return.
One of my most poignant memories from the 2008 crash was watching a few people I knew go from feeling like they were financial geniuses to bankrupt and struggling. The common theme among all of them was that they were leveraged to the hilt in real estate. They thought it was easy money when it felt like the market could only go up. Then it stopped going up and we all know what happened next.