Always different ways of looking at this, and I think it depends a lot on the type of business too.
I ran my business as a debt-free concern, owing nothing to anyone.
When the crash of 2008 arrived, we lost 70% of our business for several years, and in fact it never fully recovered even after 5 years.
Many similar businesses made massive redundancies or went bust. We retained all of our staff, they took a small reduction in wages for a couple of years, but were glad to have a job. I, and my fellow business owners took no income for a few months, then gradually we did pay ourselves a little, but not every month, until things improved. Having no borrowings at all meant we survived intact, albeit our standard of living was somewhat reduced. The other similar businesses which ran on overdraft, with leased equipment and cars, suffered badly. Thus, I repeat, it depends on your business to some degree.
As for a business model, just because you have an entity does not always protect you from debt. We were certainly an "entity", but we were a "firm"...that is to say, a standard old-fashioned partnership, so the partners were personally liable for any debt.
Having a limited company "may" protect you, but only if you don't have any personal guarantees to the bank. Some banks will only lend with personal guarantees, especially if you are a small business.
Other business models are available...a good accountant is invaluable if you are contemplating a change.
Being debt-free helped enormously when we sold the business on retiral. The purchasers got a clean sheet, we got top dollar and the whole deal was done in a few weeks.
I know it is not always possible to be debt free, but I am simply saying that it is not always a daft way to run the show. No sleepless nights, no repossessions, just tightening the belt in difficult times. On the other hand, properly managed debt can be an ideal way to run and grow a business, especially in these days of minuscule interest rates.