If you’re constantly fighting for your design you’re doing it wrong. Good Designers should be the most collaborative, ego-less, thick-skinned people in the business. Often your biggest job is mediating fights between stakeholders. The myth of hero/rockstar/ninja designer visionary is part of why we aren’t taken seriously (i.e. the ‘make it pretty’ people who create more work). The final design should have no ‘ownership’ as it reflects the collective output of your users and the product/development team; design doesn’t have sole dominion over ideas. Design is solving problems, not winning fights.