Search engine optimization is not a bad thing. In deed, SEO is a good thing because, at least in theory, doing SEO helps the cream rise to the top.
However, if you overdo SEO for your website, your website will be crowded with SEO friendly design only such as webpages are full with text links, text, text, text, text links, alt meta tags, alt meta tags, alt meta tags, alt meta tags, and more.
Your website will get the good results for search engines for sure. But what you need from those search engine search results are “potential visitors and customers” or not?
Yes, visitors will like the easy navigated websites which are friendly to their eyed too. Don’t amaze them and chase them out of your websites with overdoing search engine optimization (Overdo SEO) because you will be the loser instead.