Working at a start up where multiple investors came into the same round at different valuations; so yes, they should, it makes sense as different people bring different things to the table.
Granted, there has been a lot of PHP bashing lately and by and large, those who bash PHP the most - whether they are right or not - generally have little to no meaningful experience with it and are re-iterating whatever they've read about it. Fact.
However, this is just stockholm syndrome, plain and simple. Fabien is the author of Symfony.