Hi Philippe,
I certainly wouldn't call myself an expert, but I'll share my routine workflow. I shoot almost 100% RAW only.
I know this first bit isn't what you asked for, but I'll provide it as context ...
I import, review and cull using Nikon's ViewNX2, direct from memory card using card reader built-in to my PC, which tells you I am a Nikon shooter, although I actually also use the same method for my Canon P&S camera too.
From ViewNX; I can directly open my highest star rated images in to Photoshop CC (Right click, Open With), which actually opens the RAW file in ACR (Adobe Camera Raw).
ACR
White Balance
Basic exposure adjustments
Any gradient filters (if necessary)
Lens corrections (Chromatic Aberration), Geometry by lens profile, these are always left on by default
Rotate to correct any level issues in capture
I may or may not do 'converging verticals' type corrections in ACR, if not ACR, then later in PS after cropping
Zero sharpening
Zero Noise reduction
Open in PS CC (in 16-bit)
If necessary; Noise Reduction with Neat Image (as a Plug-in)
Cloning (if necessary)
Crop
Save full size PSD
Image size reduced (better for on-line display)
Final Sharpening using USM
Save As jpg, quality 9 (or 75%)
Most of those things are done in that specific order for very good reasons, but (for brevity) I won't go in to them in this post, but anyone is free to ask if puzzled.
Bear in mind that this is a workflow that works for me (for what I shoot), others may disagree for their own reasons. If I shoot subjects or in situations that present 'different to normal' issues, I will revise the workflow accordingly, also of course, if I'm producing a B&W (I don't do this often); sometimes I'll convert in ACR, other times in PS CC (especially if I also want a colour version).
My 'throughput' doesn't currently warrant batch processing, so every image is treated individually (although I'll set them numerically to same WB in ACR if part of a series shot under same lighting conditions). I don't use 'image effect' plug-ins.
I reserve the right to change this in future if I see benefit ![Big Grin](https://cdn.cambridgeincolour.com/forums/images/smilies2/biggrin.png)
I started using ACR in Elements many years ago, so I'm used to that interface. I did try LR once, but since I didn't want the Database side of things, I couldn't see any benefit for me learning a whole new interface which provided exactly the same functionality that ACR gives me.
I have one question for you though; what does PPI stand for?
"PP" I think I can guess, but the "I" has me stumped.
Cheers, Dave