Does Twitter now only function properly on Smart Phones?

I normally access my Twitter account on my iMac.

Videos have never worked for me on Twitter, but since this new Twitter appeared I find that now I can't see most of the photos posted & can't even see any photos I post myself.

Does this mean that from now on there is just no point in having a Twitter account unless you have a smart phone?

If so, it looks like I'll just have to close my account.

Seems wrong that you can spend a huge sum of money on a quality computer, only to find yourself shut out from accessing so many social media platforms. :-(