With advancements in chemically-strengthened glass scratches are less of an issue these days, but it’s not a completely solved issue. And if you drop your phone, the glass can still crack. Repairing a broken screen could easily cost $200-$300. An out of warranty screen repair on an iPhone 7 Plus costs $169, but you can buy a working 7 Plus for $155 or so. And that’s not an Apple issue either, Samsung Direct (in the US) will charge you $249 to replace the screen on a Galaxy S10 and again you can buy a whole phone for less than that - $234 or so (second hand, of course). Price...
Source: https://www.gsmarena.com/weekly_poll_did_you_put_a_screen_protector_on_your_phone_what_about_a_case-news-51217.php