Unless the device is malfunctioning or otherwise damaged in a meaningful way, I don't see why it would be time for new a laptop, after only 3 years. I bought mine with the prospect of it lasting at least 6 years (and it's going strong 2/3 in already), but I don't plan on replacing it unless it breaks down or prevents me from working on my stuff for other reasons.

Anyway, good choice on the new laptop. My next device will likely be a FrameWork or similar (who knows how the landscape will be then).