Chromium (that Opera is based on) has PWA support by default. So, there's a chance that Opera purposely disables it because they don't want it. Or, due to all of Opera's modifications to Chromium, maybe PWA support doesn't work without a huge effort of fixes or workarounds. If it's the former, PWA support might never happen unless Opera changes their minds. If the latter, it might be a pain to make things work.
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