Correlation High inflation vs high Bank Interest rate vs Our saving

This sounds flawed

High inflation does indeed depreciate the value of savings over time. As prices rise, the purchasing power of your saved money declines. Loans tend to shrink in real value during high inflation, as the debt becomes easier to pay back with cheaper dollars over time. This can be beneficial for borrowers.
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Borrowing for the longest possible term could potentially be advantageous during high inflation, as it locks in the debt at a fixed cost that becomes easier to manage as inflation erodes the real value of the payments over time. The money can then be used for other potentially higher-return investments
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The key is to carefully consider the tradeoffs and find the right balance of borrowing, spending, and saving that works for your individual financial circumstances during periods of high inflation.

There should be good loans/ bad debts.

So long you can earn above the interest rate that you are being charged, then yes, you should drag as long as you want.

That's leverage.

Theoretically speaking based on that one principle, answer is yes. But in real life, there are more complexities and charges. You'd find that unless you are borrowing to do a business (in the sense that you borrow to invest in something that actually pays back more), otherwise as a normal consumer you're just paying to the bank additional interests and charges which would be better off if you don't borrow in the first place.