Shrinkage is not automatically a good thing, as any guy who jumps into a cold swimming pool can tell you.
I definitely think having the CR/XP on the top line is beneficial. The rest is kinda interesting but not super useful. Particularly dropping the ability to adjudicate ties based on attribute values for example, or making it more difficult for people to parse condition and damage immunities. Poison(ed) is kinda weird when it's also going to be next to "Fire, Cold" for different demons and stuff.
Also the only reason the skeleton's sword/bow stuff can be "Streamlined" is a lucky break where the attributes and dice line up perfectly. Most monsters don't have that for all their actions/attacks/options.
Compare your 'Streamlined Version" to the A5e version.
View attachment 378338
This? This works -great- for me. Because A5e's Grapple and Shove rules are based on Proficiency+Str or Dex. So having the DC 12 there means I don't need to do math to have skeletons do more than "Walk Forward, Hit with Sword".
And with A5e including sign language with every character's language list, Skeletons can communicate even though they can't speak! Which can make encounters with them even more interesting. Though that's a slightly different subject.
But yeah, moving some stuff around is great, cutting some stuff is great, but trying to shrink it all for the purposes of making it smaller, especially at the cost of clarity, is not the vibe.