The feature is only the visible part
On paper, a project sounds like gameplay systems, multiplayer, and progression. In practice, a lot of the work that makes a release credible sits around those features: auth flows, store requirements, performance issues, usability fixes, and all the rough edges that only show up once the build is close to real users.
That is why I try to think about shipping from the start. Not because every system needs to be over-engineered, but because it helps to know what parts are likely to create friction later.
Cross-platform means design decisions get more expensive
When the same product touches WebGL, Android, and iOS, small assumptions become expensive. UI density, input behavior, performance budgets, and external integrations all get less forgiving.
The useful habit is not to solve everything upfront. It is to build the core systems so they can adapt without forcing a rewrite every time a platform-specific issue appears.
The last mile is part of the engineering job
A lot of candidates talk about building features. Fewer talk clearly about release support, bug passes, auth pain, or the cleanup needed before a team is comfortable launching.
For me, that final phase is not secondary work. It is where a lot of trust gets earned.