Yes, it is absolutely true. But that has to be with the fact that we dont use Amigas like servers or tablets or phones that need to be online 24 hours a day. So I would say it is a justified expectation from an Amiga point of view to boot in rather short time. Still 46 seconds to the Scalos bootlogo is still too much for a 68060. I can only imagine a 68030 user just waiting forever, and lets not even care about a 68020 one.
All in all, to be fair, system responsiveness seems adequate when the system has already booted and loaded.
I think the boot time is less related to 68060 than to speed of harddrive
68060 influences how it behaves when it has started. There is certainly still some room for improvements because Aros was developed on and for X86 at first of course not using amiga features like the blitter. But that has nothing to do with how fast it boots. Fast harddrive and Aros roms using as rom will make a big difference already.