Too much of anything is no good (I can think of a couple of exceptions). Too much ice cream gives you a belly ache I tell my grand kids. I have heard of plants blooming themselves to death but saw a first hand example yesterday. An excellent grower in our group brought in a Masd roseola which was covered with flowers. There were so many flowers you could hardly see the leaves.
She stated that she only left the flowers on to display it to the group. As soon as she gets it home, she plans to remove all of the flowers. It's not a large plant and that huge flower load may stress the plant to the extreme she stated. The group of seasoned growers agreed with her.
I seldom face 'too many flowers' but it pays to be aware of the problem.