Agree on many of your points.
The four things that eventually doomed the team the last two years IMO are:
-Not winning the division and having to play more on the road to advance
-Defensive struggles at multiple positions
-Lacking quality offensive depth in the lineup and bench
-Lacking quality pitching depth in the rotation
All four of these elements are looking better this season so far.
We have a 7 game lead in the division and there is really only one team (ATL) that can catch us unless we implode. WSH is 15 back as of today.
The overall defense has been enhanced with Turner & Stott in their best spots, Sosa playing excellent SS, Schwarber staying at DH and Rojas & Realmuto continuing to shine. I think the pitchers trust the defense a lot more this season and are pitching with more confidence because of that.
The offensive depth is improved with the continued growth of Bohm, Stott & Marsh along with Sosa & Rojas showing more than expected. Plus, like you said, we at least have options in Pache, Clemens et al. if someone gets nicked up or struggles. Merrifield has been the one flop, we have to hope he improves or DD finds a better option. Casty? I've pretty much resigned to what he is: solid defensively and a streaky roller coaster at the plate. I cannot even whine about Stubbs who is doing the best he can.
The rotation depth is definitely better or performing better so far. Suarez & Sanchez have been revelations to support the stability of Wheeler & Nola. Turnbull a pleasant surprise as well. Only Walker remains a question mark; hopefully he finds a groove and can contribute more. I assume they will skip him in the playoffs again if all goes well.
Health issues may force DD's hand, but otherwise we are in really great shape and have maximum optionality at the deadline. We'll see what happens!