It is possible to buy a house with money you saved. This also makes a lot of sense when the house will be passed on to the next generation (like it is done in africa).
Debt is spending your future cashflow for short term gains. Cash flow/liquidity is much more important than equity and net wealth(short term). I'm sure you know the old principle of "being poor is expensive" and "you need money to make money". Debt takes away your liquidity, the small things/"broken windows" you will always need to care for become neglected. Unplanned emergencies ruin your plans,etc...
At a national level, you should know how many african nations have borrowed endlessly and still gotten nowhere. Even after debts are forgiven and stable peacful times last decades.
Accepting debt is accepting a parasite. Havig a plan to pay it off is essentially saying you have a plan to kill the parasite before it kills you. Similar to how people think "it's ok, I can quit" before getting hooked on drugs.
YMMV.