It's not really about the interest rate alone — it's about what the debt is actually for.
It's the same tool either way — debt — but the outcome is completely different, depending on what it's used for, and whether what you get back is actually worth more than what you pay in interest.
Knowing these two rules matters because they're limits banks legally can't cross, and rights you're automatically given, whether or not anyone tells you about them.
Debt is a tool, available through either a conventional or an Islamic structure, and it always costs something real. It's tracked over time through your credit score. Whether it ends up helping you or hurting you comes down to what it's actually for, and staying within limits you personally can handle — even below what a bank would legally approve you for.
Even though the Central Bank caps the Debt Burden Ratio at 50%, that's a legal maximum, not a target. Many financial advisors here recommend staying well under it, since the legal limit is about what a bank is allowed to approve you for — not about what's actually comfortable to repay every month.