Did any team ever have an easy time winning the Champions League? As far as I can remember, no team ever went through the Champions League as if there was no real competition. All the titles that Real Madrid won over the course of the last decade came with a lot of luck and a lot of effort. Some of the titles could have gone either way. Think about all the last second goals they scored or the times when there was no VAR and scored offside goals against Bayern Munich.
Although what you say is true, Madrid have always been the most successful club in the Champions League, but when it comes to competition we can't say it's easy.
In the last decade alone we can see that there are several clubs that actually need to be taken into account where in the Cristiano era in Madrid we saw Barcelona who have always been one of the troublesome clubs not to mention Atletico who have tried to make a breakthrough as well as the Liverpool era with Klopp and of course Manchester City with Pep who are now even the main competitors.
Madrid with their wealth of experience are always in a different place for the trophy but that doesn't mean the competition here is easy because in the end we must realize that for the Champions League the competition is even more difficult where the pressure and tension that is difficult to explain makes the Champions League always seem much more tense than the league in domestic competitions although domestic competitions are very good but the Champions League is clearly always the best so the competition here is very tough.