You don't need hundreds of species, just the main good ones.
All microbiome tests I've seen contained hundrets of gut bacteria not commercially available as probiotic.
https://www.nature.com/articles/s41467-020-18476-8 mentions the following bacteria as part of a healthy microbiome:
Alistipes senegalensis
Bacteroidales bacterium ph8
Bifidobacterium adolescentis
Bifidobacterium angulatum
Bifidobacterium catenulatum
Lachnospiraceae bacterium 8_1_57FAA
Sutterella wadsworthensis
https://blog.thryveinside.com/top-10-probiotic-bacteria/ mentions these:
Akkermansia
Alistipes
Bacteroides
Bifidobacterium
Blautia
Eubacterium
Faecalibacterium
Lactobacillus
Roseburia
Ruminococcus
GI Map these:
Firmicutes
Bacteroidetes
Bacteroides fragilis
Bifidobacterium spp.
Enterococcus spp.
Lactobacillus spp.
Clostridia spp.
Enterobacter spp.
Akkermansia muciniphila
Faecalibacterium prausnitzii
And
https://microbiomeprescription.wordpress.com/videos/jason-hawrelak-criteria-for-healthy-gut/ suggests ranges in healthy individual:
Genera (or Species) - ideal %
Bacteroides spp. <20
Faecalibacterium prausnitzii >10-15
Eubacterium spp. up to 15
Roseburia spp. 10-15%
Ruminococcus spp. up to 15
Blautia spp. 5-10%
Total butyrate producer percentage >40
Bifidobacterium spp. >2,5-5
Akkermansia spp. 1-3%
Lactobacillus spp. 0.01-1
Escherichia coli <0.1
Methanobrevibacter spp. ~0.01
Bilophila wadsworthia <0.25
Desulfovibrio spp. <0.25
Only Bifidobacterium and Lactobacillus is commercially available, but will together only replace 6%, at the most. And interestingly the microbiome of the Hadza tribe still containing up to 2000 species, doesn't even contain any Bifido or Lacto.