Lost Nuetral - Turning Lights On Stops Others Flickering

Question

Today we had lights flickering, odd brown outs, and power surges. Problems would come and go. Called our power company. The man they sent determined we had lost our connection to the neutral.
Before calling, I tried my hand at determining if it was something in the house.  Discovered a really odd symptom.  The lights in the kitchen would be flickering, but when I turned on the basement lights, the kitchen lights would stop flickering. That's when I realized it was over my head. When I learned to wire ACs 40 years ago, increasing load shouldn't improve load on another circuit.
Any idea why that would happen? If I have another problem brewing, I'd like to know and get it fixed before it becomes something.
Both are on the old panel from the 80's.  As we can afford, we're moving things to the new panel.  The basement lights are fluorescent and one ballast probably needs replacing.  The kitchen lights are screw in LEDs.
Thanks
Update: Am satisfied with the answer. Thanks. And dimmers are way too high tech for this place. (Don't let it know about the WiFi.)

manassehkatz-Moving 2 Codidact · Accepted Answer

With a neutral, everything is forced to be split 50/50, regardless of load. When you have a lost neutral, your circuits that are normally ~ 120V can be anywhere between 0 V and 240 V.  The voltage on each side will float depending on the relative load of each side. Add more load and things could even out.
Some devices won't work well outside a narrow range - perhaps 100 V - 130 V. Many devices can handle a wide range for internationalization - e.g., 90 V - 250 V. But go too low, especially below 90 V, and a lot of devices simply won't work properly. Flickering lights would be the least of the problems. LED lights in particular will flicker if voltage is too low, unless (and sometimes even if) they are designed to be dimmer-compatible.

Lost Nuetral - Turning Lights On Stops Others Flickering

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