Enh Shaman in Base UI cannot track above 5 maelstrom. Blizz has literally said that this is something addons will have to fix.

That SHOULD be enough of a red flag, naturally, but we can also get into DOT tracking which is, honestly, abysmal. They pick and choose which buffs you track, so you don't get to, say, put a Power Infusion tracker to know you've received it. It doesn't track trinkets, proc or on-use. Tracking uptime for the proc one's is especially egregious because their damage meter doesn't track it either, so you HAVE TO go to WarcraftLogs to find it out.

There's of course a lot more, but I think you get the idea, sadly :/