Lte latency is ok for gaming, it's sometimes faster than aDSL. As you said, the problem occurs when congested, which in my experience is either always or when you are free to game (drawing parallels to traffic).
But to be absolutely fair, aDSL latency isn't good. On the same hardware, i went from 70-80 ms on aDSL to 10-15ms (in various games, not raw icmp) when i switched to fiber. Sure, for most games that isn't that much but try to do any kind of competitive gaming and you very quickly end up in situations where ping becomes an issue.
But to be absolutely fair, aDSL latency isn't good. On the same hardware, i went from 70-80 ms on aDSL to 10-15ms (in various games, not raw icmp) when i switched to fiber. Sure, for most games that isn't that much but try to do any kind of competitive gaming and you very quickly end up in situations where ping becomes an issue.