Indie devs too. To be fair, listening to a former developer actually talk about the reveals and comment on the PS5's SSD, the IO speeds of the SSD are a big deal to devs. I don't think the compliments are posturing or shilling. Dealing with IO bottlenecks cause a lot of wasted time and resources in development and use up a ton of hardware resources for decompression....or devs simply scale environments, add load times, reduce texture quality, reduce draw distance, etc. to compensate. So the IO speeds of the PS5 are real development time savers. Less need for workaround. They will free up CPU and memory resources for the same level of graphics.
That said...Microsofts SSD, while slower, does something similar. It also acts as a scratch pad and can store textures saving system resources. Digital Foundary demoed this showing how something that would've taken 5 CPU cores now takes a fraction of 1. They have their own feature set to aid with this...which isn't ready. It may accomplish the same thing. No knowing if it's easier or more difficult to use. No knowing where the sweet spot in IO speeds is to leverage this. I have a gut feeling that unless your traveling across an open world map at a really high speed, you'll never test the IO speeds in the Series X.
So my conclusion is that the devs praising the PS5 are legit. They may also praise Series X for the same thing. We won't know until Microsoft's tools are ready. They're clearly behind. The fact that Microsoft was one of the first corporations hit by the coronavirus didn't help.
I still expect the Series X to be the best bang for the buck in multiplats. Ray tracing is very demanding and will likely offset any other potential gains if that's what devs use the resources for. When hardware is in the same ballpark, ease of development and the tools are actually more important long term than max theoretical power both for 3rd party optimization and for 1st/2nd party devs. There's a very incomplete picture there. I'd be shocked if Microsoft, being an AI/ML leader in the world and now behind the gaming business aren't in good shape with tools once everything is eventually ready. Today they are not ready to show that.
Edit: I also think it's impossible to talk about the strengths and weaknesses of a new piece of hardware without using differences of other tech as a point of reference. I think as long as we're not posting memes or fanboy Youtube videos, we should be allowed to refer to those.