Alternative evolution mechanisms using cell fusion

I am trying to understand if it would be possible for organisms to evolve by different means other than random mutations and natural selection. Eukaryotes were predicted to be formed by fusion with other organelles that got them their nucleus and mitochondria (endosymbiosis). Why can't this fusion process systematically continue on for larger organisms on a larger scale? For example why can't multicellular organisms detect other appropriate multicellular organisms in their environment as matches and fuse with them to form a more complex organism (in addition to traditional evolution also happening)?

Question: What biological factors prevent organisms from continuously fusing with one another? Is it possible even hypothetically for it to work?

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Alternative evolution mechanisms using cell fusion

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