WIFI on our buses during travel?

If you are asking about the buses on Risk Steves tours, the answer is maybe. Some buses do, others don't. No way to know in advance.

Only one of our tour buses had wifi, and our guide asked folks to look out the window instead.

Rick Steves doesn't have their own buses, they work with local companies and the details can vary.

BTW, most of the people on the forum don't actually go on RS tours, but there is a section just for tour questions.
https://community.ricksteves.com/travel-forum/tours

I've taken a fair number of public intercity buses in Europe that had Wi-Fi, but it tended to come and go--I assume for technical reasons. If it's really important to you, it would be smart to have data service on your phone or tablet.

Not all buses are going to have Wi-Fi; don’t assume it. Where are you going? Are you talking about intercity buses? City buses? Private tour buses?

Why do you need wifi on the tour bus when there is lovely scenery all around you?

I think this is a valid question and am assuming you mean the bus on an RS tour.

Many people actually use it on the bus to check on something for an upcoming stop. Sometimes people use it to find out more information regarding something the guide might have mentioned. There are also folks who are still working and need to check in occasionally so the bus is a good time for that.

My last experience on Best of Italy was that it was not strong and not dependable. Some could get connected some of us could not.

For those going on the Best of Turkey or Best of Istanbul tours, neither of the tour buses that I was on had wifi.

By comparison if you watch train vloggers they will tell you that sometimes on a train it stinks and sometimes it's fantastic

To be honest, I think the same answer applies pretty much anywhere in Europe: it depends.

You’ll find some local city busses that have it while someone distance trains won’t. Even if a bus or train has WiFi, it may be very spotty or slow. I’ve seen the same thing in the USA on Amtrak trains and greyhound busses