Our debt is higher than our GDP and getting into the range where other countries have been forced into austerity - https://worldpopulationreview.com/country-rankings/debt-to-gdp-ratio-by-country
We’re protected by our unique status as the worlds primary reserve currency - but current government actions are weakening that and that benefit can disappear quickly if we don’t return to sanity - https://www.investopedia.com/terms/r/reservecurrency.asp
Interest on debt is the second largest part of annual government expenses - https://www.pgpf.org/programs-and-projects/fiscal-policy/monthly-interest-tracker-national-debt/

While you’re right about debt not being an immediate threat and that there is no hard limit, that’s very different from calling it a lie and not a concern.

An actual limit is determined by the market, by whatever other countries are willing to accept, and by what the alternatives are. Historically US had the largest economy, largest global trade, strong allies and trading partners across the countries with the strongest economy, and some of the largest financial corporations in the world. Economic and financial policy has traditionally been maintained by competent and independent administrators and government policy has generally encouraged world trade. There are solid reasons for our special place in the world economy, but it’s not magic nor should we take it for granted.

Now our debt is getting in range where other countries have had runaway inflation or forced austerity. Our payments are crowding out other things we could do if we could afford it. Our competent and independent administrators have been replaced by yes-men. Government policy is chaotic at best and seeming governed by whim, personal spite, and exploiting the government for personal enrichment. We’re turning away from global trade, becoming isolationist and protectionist, attacking our most important allies and trading partners, abandoning the needier countries. The trigger will be other countries giving up on us and we really seem to be asking for that.

And even worse, what are we getting for that money? Maybe we could excuse greater debt if it is an investment in future business technology or science, or improved well being for our citizens. But we have this huge debt and a century of deferred infrastructure work, the most expensive healthcare in the world while being nowhere near the best, declining health, education and life expectancy. We seem to be actively avoiding technologies of the future.

No the analogy of the home equity loan is more relevant. There is something of value backing it we are exceeding that, but we’re doing so to buy avocado toast and our daily Starbucks instead of fixing that leak in the upstate’s shower, while not being able to afford our medicine or our kids school supplies. There may not be a specific limit but we’re in awfully deep and still digging the hole deeper