I totally agree. I got forwarded a skype for business invite this morning for a meeting with Microsoft and I haven't used it before. I clicked on the link followed the instructions, which meant installing a pkg on my mac.
The thing that struck me was that after installing the pkg I got taken straight to the conference - I didn't have to go back to the link, put any ID / PIN or anything. It was seamless.
The seamless redirect after install is a nice touch. However the "receive link in email for software/plugin download to install so you can do this important thing" harkens back to earlier times and is the classic malware infection scenario. I guess it still works because enough people still do it.
The thing that struck me was that after installing the pkg I got taken straight to the conference - I didn't have to go back to the link, put any ID / PIN or anything. It was seamless.