I don't think detrimental means what I think you think it means
In terms of ground moves, TL has much better follow-up options in terms of spamming than Link does. His arrows and bombs move slower (boomerang is the same as Link's, but I'm just guessing there) and with TL's movement speed, it allows for him to get to his opponent in time to take advantage of the opening it creates when it hits. Having those attacks as legitimate follow-ups makes the ground game seem excellent when it might not be quite that amazing.
Let's get into the nitty-gritty details of zair guys
First off, I disagree with Rizen in terms of TL zair usage. Most TLs I've played/watched use it pretty often.
Next, Zair is a shield-pressure option for Link as well, "King"
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And finally, THE BIG ESSAY YAAAAARGH I THOUGHT I WAS DONE WITH THESE IN HIGH SCHOOL: There's a couple of different ways to approach this discussion:
You can talk about zair as a move. Both have the same startup time, cooldown time, and landing frames (0). Link's has a better reach and a chance for a second hit. It has superior shield pressure capabilities. It has superior damage output. Both can be used for ledge shenanigans. Link's can also be used legitimately as a recovery move. In terms of the move itself, Link's zair is the superior version. It's childish to fret about this, however--a move analysis is superficial at best.
You have to look at the move in the bigger picture of the characters' playstyles. Both use zair to outspace other characters. When zair connects, both can follow-up on zair even at full range. Both use it as a legitimate shield pressure. Link: because of his falling speed (making timing less relevant), does more damage with the second hit. TL's can outrange many opponents, has air maneuverability to make zair safe at most ranges(making timing less relevant), and TL can get a solid follow-up of his choice even at maximum range while retreating in the air. Link's zair does more damage, but TL's can set up for usmash.
Zair serves roughly the same purpose in both character's playstyles. All things considered, the damage it does to opponents is about similar. They're pretty freaking equal. They're supplementary moves.
I'd write more and give a good summary but writing this is boring me beyond my imagination, so you guys can come up with one. Oh, wait, here's a good mushy summary: both use them in the same way and so they are pretty much equally as good. The end goodbye