Plexweb will Direct Play almost nothing. <—it runs in your browser.
Plex for Whatever and PMP will Direct Play almost
everything. <–they don’t run in your browser. <—they are Player Apps.
I have my TV connected to the server machine via an HMDI cable.
I’d be a FOOL to drag Plexweb to the TV to transcode everything when I can drag either player app to the TV and Direct Play everything.
PMP is a very powerful player app with powerful and enhanced features available ONLY while in TV View Mode. <—the mode designed to work better on your TV - without some of these:

Plex for Whatever was Plex’s Dream app - they thought they’d sneak in 'cause nobody wanted a HTPC app with TV View Mode any more… WRONG!
If you don’t think you need TV View Mode on the TV, you do, you just don’t know it - or you have some Plex-Nocs-9000s sitting on the end table - the rest of those noisy HTPC users do need TV View Mode and they’ll be back in force if anything ever threatens that view mode again.