A simple implementation for UITableViewSection.

UITableViewSection.swift

class UITableViewSection: NSObject {
    private(set) var items = [AnyHashable]()
    private(set) var sectionIndex: Int!
    
    private let itemsPublisher: AnyPublisher<[AnyHashable], Never>
    private let cellProvider: (UITableView, IndexPath, AnyHashable) -> UITableViewCell
    
    private var subscriptions = Set<AnyCancellable>()
    
    convenience init<T: Hashable>(
        items: [T],
        cellProvider: @escaping (UITableView, IndexPath, T) -> UITableViewCell
    ) {
        self.init(
            items: Just(items),
            cellProvider: cellProvider
        )
    }
    
    init<T: Hashable, P: Publisher>(
        items: P,
        cellProvider: @escaping (UITableView, IndexPath, T) -> UITableViewCell
    ) where P.Output == [T], P.Failure == Never {
        self.itemsPublisher = items.map { $0 as [AnyHashable] }.eraseToAnyPublisher()
        self.cellProvider = { cellProvider($0, $1, $2 as! T) }
    }

    func attach(to descriptor: UITableViewDescriptor, sectionIndex: Int) {
        self.sectionIndex = sectionIndex
        
        itemsPublisher.sink {
            self.items = $0
            descriptor.updateSnapshot()
        }.store(in: &subscriptions)
    }
}

extension UITableViewSection {
    func cellForRow(in tableView: UITableView, indexPath: IndexPath) -> UITableViewCell { cellProvider(tableView, indexPath, data[indexPath.row]) }
    func numberOfRows() -> Int { items.count }
}