Why should I “enclose the previous parenthesis with ‘{}’”?

Apparently, the developer of chktex advises to always do something like

{(a+b)}^2

which is not what's normally done. There's no need for it and the output is very disputable in typographic terms: compare by yourself, left the normal, right the braced combo:

\documentclass{article}
\begin{document}

\begin{equation}
(a+b)^2 \quad {(a+b)}^2
\end{equation}

\begin{equation}
(\sqrt{2}+1)^2 \quad {(\sqrt{2}+1)}^2
\end{equation}

\end{document}

The second one is obviously wrong. The warnings of chktex are

Warning 3 in badchk.tex line 5: You should enclose the previous parenthesis with `{}'.
(a+b)^2 \quad {(a+b)}^2
    ^
Warning 3 in badchk.tex line 9: You should enclose the previous parenthesis with `{}'.
(\sqrt{2}+1)^2 \quad {(\sqrt{2}+1)}^2
           ^

and I heartily disagree.