Most people, particularly those below a certain age, browse the web on their phones. Even when they get home they pull out a phone to look something up.
Should making a website be about what makes an easy life for the developer, or should it be about what works for the website visitor?
If you want to do a "proper job" you'll have a mobile variant that works in portrait mode.
Here's a tip: you don't have to squash in everything you might have in a desktop site into a mobile version. Simplify. No tiny text to cram it all in. No tiny buttons.
Do the right thing - it's about the site visitor not the site developer's convenience.
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