arm support would be very nice.. certainly for backup / dns / mail servers where cpu performance isn't a critical issue.
for actual webservers, i've used both arm and x64, and i liked arm because it was so cheap, but for actual websites,
the modern amd servers leave arm servers standing.
there's a good performance comparison of arm / old intel, older and newer amd cpu's (hetzner servers) here...
https://www.reddit.com/r/hetzner/comments/1pano24/hetzner_cloud_server_benchmark_cx_vs_cax_vs_cpx/
the panel ui could do with some tweaks, maybe some different paths to reach some data..
but smoother animations? why? apart from maybe progress bars, and the little circle sometimes when loading a page, which seems fine, i see no point in any animations. it's a control panel, people want to log in, get something done and log out.. not sit there admiring an animation...
and which modern hosting panels does it look outdated against?
plesk doesn't look all that great (and it's a resource hog), cpanel is hideous, it looks like a throwback to windows 3.1