What difficulties can arise with the promotion of resources on various subdomains?

Question

Search Engine Optimization

Description of the problem:
There is a network tour. agencies for which dynamic content is generated: countries, hotels, resorts, specials. offers (a trip to a specific hotel). It is necessary to implement various resources, since the tour. agencies are representatives of various tours. operators.
Some types of content (countries, resorts, hotels) are common to all subdomains, special. offers are specific to each subdomain.
Question:
Seo rejects this architecture, justifying the affiliate with a filter and the complexity of promotion. What difficulties can still arise with promotion, is it possible to get around them?

Answer 1

They won’t give you any affiliate, I’m speaking from practice (I worked in tourism for several years, a large project, about 50 subdomains for cities, duplicate content, etc.). The only problem is that each subdomain is a separate site, hence the difficulties in promotion, resulting in good financial costs.
But no one bothers to link everything with each other and sculpt satellites (: