[Lampard]

great web design is a must . but dont forget the user experience . good web desing need a great user experience of using it . make the design that is easy to use and can give the user great experience .

but some of the great design really slow old device down espescially the website that have lot of heavy css and javascript

That depends who is programming it
You can even make a great looking website and that will be also compatible with old devices.

[Zorono]

great web design is a must . but dont forget the user experience . good web desing need a great user experience of using it . make the design that is easy to use and can give the user great experience .

but some of the great design really slow old device down espescially the website that have lot of heavy css and javascript

Agree with you but minifing the template's source (CSS, JavaScript...) Could solve this problem but at first there must be some optimise... Use MySQL as your Main Database saving/loading module as it's the fastest module on my opinion...

[TimeRider]

A website will exist if it has a good design.

Nowadays, there are lots of CMS like Wordpress where you can choose a lot of themes. Design is not problem these days like in the days of HTML or php. You can also get a custom banner or logo online.

So, it's not hard these days to design something. But Designing is not just important for a website to look better but to hold the visitors.