I played an enchanter for most of the classic era.
A few things are different that make enchanters markedly stronger:
+Lull spells work - they did not in classic. People knew how they SHOULD have worked - by the time I started playing, in february 2000, the spell files were broken down and the information on how spells worked was widely available. I knew how lulls worked or should have. They just did not work. They weren't fixed until midway through Luclin AFAIK - my guess it was a stealth addition in the luclin resist patch. While enchanters are not the only class to have the spell line, the rest of their arsenal make them in a better position to take advantage of the spell line.
+The resist rate are much lower on P99 on certain ranges of mobs: In classic, any mob could resist you - even greens. You always had a minimal chance to get resisted. In p99, provided you have a sufficient level advantage, you will not get resisted. High blues, yellow, red cons - this seems to work fine in p99. But mid and low blues, no. In classic, you could (would) get a string of resists and it would kill you. Now this is not particular to enchanters specifically, but I feel this is having a greater impact in mitigating risk.
The channeling thing, I don't buy it. In classic, once you got high enough, you could reliably channel. I suspect channeling worked the same way as tradeskills do,which is to follow this patter:
https://wiki.project1999.com/SimplifiedTradeskillTable . So it probably is a lot easier at lower levels but overall I don't think this is meaningful.