It could be. I have twice been burned by LineageOS. I wanted a deGoogled Android phone, but the only LineageOS-supported models that were available in my region, and which I could afford, had been initially released already 1.5–2 years before. Not only was my new phone soon abandoned by the manufacturer, it was also suddenly dropped by LineageOS after only about a year of my owning it.
The prospect of truly long-term support for years and years is one reason I bought a PinePhone and have been keeping track of its development. But sadly the current PinePhone has too ancient and underpowered a CPU to be useful.