I would have thought that you installed Avast to keep your systems safe not for it's ability to remotely access another computer.
As i say before, Avast never was the best AV. There are many another AVs "to keep my system safe". But Avast was a lone "good_AV + remotely_help" solution. So, your assume is wrong: literally i installed and recommended to install Avast on
many PCs just "for its ability to remotely access another computer".
If both computer are on Windows 10, you can use Quick Assist.
Thanks, but this isn't an option. There is a wide range of OS in my near environment (family and friends) from XP to 10 (excluding Vista probably). Avast was the solution that covers them all. After losing the option (without any warning, as you definitely know, which is at least disrespectful) i was forced to switch to TeamViewer that is much more complex. So i was forced not only to install it on many PCs but also to teach their users how to use it correctly and safely. This abruptly task make me angry for a long time.
Think, i never install Avast again. Even if it unquestionably becomes a #1 AV in the existence, i'll chose the second one
P. S. Saying about "keeping your system safe" again, there is one simple rule to do it: never open a file from an untrusted source (and if you think that the file source is trusted, think twice). I personally didn't see AV warnings on my main PC for many years already. Sadly, some users can not be taught to follow the rule, so they really need an AV.