Oh my. Many people seem to disagree~
Look. Lookahead is important. It's definitely necessary for reaching sub 15 or less. But sub 30?
No. TPS is really hard to work on because it's so hard to find a consistent turning style. Look ahead is not. All you need to do is find ways to practice.
What you need to get good and how to practice improving at it:
Algs:
Get on an alg website and go ham.
TPS:
Adapt to a fast one early on, and don't worry about it later.
OR
Get to sub-15 and realize that you've been depending on a low TPS for lookahead (not taking shots btw)
Work for days to weeks to months getting used to lookahead without a lower TPS.
Lookahead:
Consciously watch where your pieces move while you do F2L. (and yes, you can do this with a high TPS)